{
  "source_id": "10.3176/chem.1991.3.04",
  "archive": "Estonian Academy Publishers archive (kirj.ee)",
  "publisher": "Estonian Academy Publishers",
  "journal": "Proceedings of the Estonian Academy of Sciences. Chemistry",
  "journal_original": null,
  "year": 1991,
  "volume": "40",
  "issue": "3",
  "pages": "149–156",
  "first_page": 149,
  "last_page": 156,
  "title": "О ВЫБОРЕ ПОКАЗАТЕЛЕЙ ДЛЯ КЛАССИФИКАЦИИ ГОРЮЧИХ СЛАНЦЕВ И ГРАНИЧНЫХ ЗНАЧЕНИЯХ ПАРАМЕТРОВ (ОПЫТ КЛАСТЕРНОГО АНАЛИЗА)",
  "title_en": null,
  "authors": [
    "Kaarli Urov",
    "Vello Kadarpik",
    "Ada Sumberg"
  ],
  "language": "Russian",
  "language_evidence": "Cyrillic (Russian) title as deposited; Crossref language=en is unreliable for this publisher (PDF spot-check: Cyrillic-titled items tagged en/de have Russian body text)",
  "doi": "10.3176/chem.1991.3.04",
  "landing_page": "https://kirj.ee/proceedings-of-the-estonian-academy-of-sciences-chemistry-publications/?filter[year]=1991&filter[issue]=898&filter[publication]=7531",
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  "license": "CC BY 4.0",
  "license_url": "http://creativecommons.org/licenses/by/4.0/",
  "license_evidence": "crossref license field (publisher policy page says CC BY-NC 4.0; see notes)",
  "license_notice": "Translated from Russian. Original: Kaarli Urov, Vello Kadarpik, Ada Sumberg, “О выборе показателей для классификации горючих сланцев и граничных значениях параметров (опыт кластерного анализа)”, Proceedings of the Estonian Academy of Sciences. Chemistry, 1991, vol. 40 no. 3, pp. 149–156, https://doi.org/10.3176/chem.1991.3.04. Published by Estonian Academy Publishers; license CC BY 4.0 (http://creativecommons.org/licenses/by/4.0/) as deposited with Crossref by the publisher (the publisher's policy page names CC BY-NC 4.0). Changes: translated into English.",
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  "record_url": "https://api.crossref.org/works/10.3176/chem.1991.3.04",
  "record_source": "harvested 2026-10-14 from the publisher's API"
}