[
  {
    "id": "natanov",
    "title": "Natanov Collection — sources and notes",
    "url": "https://ediknatanovcollection.com/sources",
    "type": "Collection-owner account",
    "accessed": "2026-09-22"
  },
  {
    "id": "object",
    "title": "Natanov Collection — Suprematism record",
    "url": "https://ediknatanovcollection.com/work-malevich-suprematism",
    "type": "Collection-owner account",
    "accessed": "2026-09-22"
  },
  {
    "id": "exhibitions",
    "title": "Natanov Collection — exhibition history",
    "url": "https://ediknatanovcollection.com/exhibitions",
    "type": "Collection-owner account",
    "accessed": "2026-09-22"
  },
  {
    "id": "samarkand",
    "title": "Natanov Collection — Samarkand 1941–1943",
    "url": "https://ediknatanovcollection.com/publication-samarkand-1941-1943",
    "type": "Collection-owner publication",
    "accessed": "2026-09-22"
  },
  {
    "id": "getty",
    "title": "Getty Provenance Index",
    "url": "https://www.getty.edu/databases-tools-and-technologies/provenance/",
    "type": "Institutional research resource",
    "accessed": "2026-09-22"
  },
  {
    "id": "cdwa",
    "title": "Getty CDWA — Creation",
    "url": "https://www.getty.edu/publications/categories-description-works-art/categories/object-architecture-group/4/",
    "type": "Cataloguing guidance",
    "accessed": "2026-09-22"
  },
  {
    "id": "ownership",
    "title": "Getty CDWA — Ownership / Collecting History",
    "url": "https://www.getty.edu/publications/categories-description-works-art/categories/object-architecture-group/23/",
    "type": "Cataloguing guidance",
    "accessed": "2026-09-22"
  },
  {
    "id": "aaa",
    "title": "Archives of American Art — provenance research guide",
    "url": "https://www.aaa.si.edu/collection-features/a-guide-to-provenance-research-at-the-archives-of-american-art",
    "type": "Institutional research guide",
    "accessed": "2026-09-22"
  },
  {
    "id": "technical",
    "title": "National Gallery — Technical analysis",
    "url": "https://www.nationalgallery.org.uk/paintings/glossary/technical-analysis",
    "type": "Institutional research resource",
    "accessed": "2026-09-22"
  },
  {
    "id": "imaging",
    "title": "National Gallery — Multimodal analytical imaging",
    "url": "https://www.nationalgallery.org.uk/research/research-partnerships/multimodal-analytical-imaging-of-old-master-paintings-addressing-the-challenges-of-registration-mosaic-construction-and-image-resolution",
    "type": "Institutional research resource",
    "accessed": "2026-09-22"
  },
  {
    "id": "vaneyck",
    "title": "National Gallery — The Arnolfini Portrait",
    "url": "https://www.nationalgallery.org.uk/paintings/jan-van-eyck-the-arnolfini-portrait",
    "type": "Museum object record",
    "accessed": "2026-09-22"
  },
  {
    "id": "frick",
    "title": "The Frick Collection — Digital Archives",
    "url": "https://www.frick.org/library/archives/digital_archives",
    "type": "Institutional archive",
    "accessed": "2026-09-22"
  },
  {
    "id": "rkd",
    "title": "RKD — Digital collection",
    "url": "https://www.rkd.nl/collectie/digitale-collectie",
    "type": "Institutional research resource",
    "accessed": "2026-09-22"
  },
  {
    "id": "momus",
    "title": "MOMus — The Costakis Collection: Avant-Gardists",
    "url": "https://www.momus.gr/en/exhibitions/i-syllogi-kostaki-kallitehnes-protoporoi",
    "type": "Museum exhibition record",
    "accessed": "2026-09-22"
  },
  {
    "id": "abstraction",
    "title": "MoMA — Inventing Abstraction, 1910–1925",
    "url": "https://www.moma.org/calendar/exhibitions/1273",
    "type": "Museum exhibition record",
    "accessed": "2026-09-22"
  },
  {
    "id": "matisse",
    "title": "MoMA — Henri Matisse: The Cut-Outs",
    "url": "https://www.moma.org/calendar/exhibitions/1429",
    "type": "Museum exhibition record",
    "accessed": "2026-09-22"
  },
  {
    "id": "morozov",
    "title": "Fondation Louis Vuitton — The Morozov Collection",
    "url": "https://www.fondationlouisvuitton.fr/fr/evenements/icones-de-l-art-moderne-la-collection-morozov",
    "type": "Museum exhibition record",
    "accessed": "2026-09-22"
  },
  {
    "id": "yaroslavl-2005",
    "title": "Unknown Avant-Garde",
    "url": "https://ediknatanovcollection.com/exhibition-yaroslavl-2005",
    "type": "Collection-owner account",
    "accessed": "2026-09-22"
  },
  {
    "id": "nizhny-2005",
    "title": "Russian Avant-Garde: Known and Unknown",
    "url": "https://ediknatanovcollection.com/exhibition-nizhny-2005",
    "type": "Collection-owner account",
    "accessed": "2026-09-22"
  },
  {
    "id": "perm-2005",
    "title": "Masters of the Russian Avant-Garde",
    "url": "https://ediknatanovcollection.com/exhibition-perm-2005",
    "type": "Collection-owner account",
    "accessed": "2026-09-22"
  },
  {
    "id": "yekaterinburg-2005",
    "title": "Theatre of the Russian Avant-Garde",
    "url": "https://ediknatanovcollection.com/exhibition-yekaterinburg-2005",
    "type": "Collection-owner account",
    "accessed": "2026-09-22"
  },
  {
    "id": "yekaterinburg-2009",
    "title": "Russian Avant-Garde and Its National Origins",
    "url": "https://ediknatanovcollection.com/exhibition-yekaterinburg-2009",
    "type": "Collection-owner account",
    "accessed": "2026-09-22"
  },
  {
    "title": "Edik Natanov",
    "url": "https://ediknatanovcollection.com/exhibitions",
    "type": "Collection / institutional source",
    "accessed": "2026-09-22"
  },
  {
    "title": "Sergei Shchukin",
    "url": "https://www.fondationlouisvuitton.fr/en/events/icons-of-modern-art-the-shchukin-collection",
    "type": "Collection / institutional source",
    "accessed": "2026-09-22"
  },
  {
    "title": "Ivan Morozov",
    "url": "https://www.fondationlouisvuitton.fr/fr/evenements/icones-de-l-art-moderne-la-collection-morozov",
    "type": "Collection / institutional source",
    "accessed": "2026-09-22"
  },
  {
    "title": "Mikhail Morozov",
    "url": "https://www.fondationlouisvuitton.fr/fr/evenements/icones-de-l-art-moderne-la-collection-morozov",
    "type": "Collection / institutional source",
    "accessed": "2026-09-22"
  },
  {
    "title": "George Costakis",
    "url": "https://www.momus.gr/en/museum/museum-modern-art",
    "type": "Collection / institutional source",
    "accessed": "2026-09-22"
  },
  {
    "title": "Peggy Guggenheim",
    "url": "https://www.guggenheim-venice.it/en/art/in-depth/peggy-guggenheim/about-peggy/",
    "type": "Collection / institutional source",
    "accessed": "2026-09-22"
  },
  {
    "title": "Ernst & Hildy Beyeler",
    "url": "https://www.fondationbeyeler.ch/en/beyeler-collection",
    "type": "Collection / institutional source",
    "accessed": "2026-09-22"
  },
  {
    "title": "Dorothy & Herbert Vogel",
    "url": "https://www.nga.gov/stories/articles/remembering-vogels-modern-art-collectors",
    "type": "Collection / institutional source",
    "accessed": "2026-09-22"
  },
  {
    "title": "Norton Simon",
    "url": "https://www.nortonsimon.org/art",
    "type": "Collection / institutional source",
    "accessed": "2026-09-22"
  }
]