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^ Byrd, Andrew Miles (2015) The Indo-European Syllable (Brill's Studies in Indo-European Languages & Linguistics; 15), Leiden: Brill, page 272: “*pei̯h₂-”
^ Adams, Douglas Q. (2013) “pitke”, in A Dictionary of Tocharian B: Revised and Greatly Enlarged (Leiden Studies in Indo-European; 10), Amsterdam, New York: Rodopi, →ISBN, page 412: “*pitk-”
^ Pan, Tao (2019) “TB pitke ‘fat, grease, oil’ and PIE *peih̯₁- ‘to be fat, be bursting with’”, in Indogermanische Forschungen, volume 124, number 1, De Gruyter, →DOI, pages 265-278
^ Sadovski, Velizar (2017–2018) “Chapter VI: Iranian”, in Klein, Jared S., Joseph, Brian D., Fritz, Matthias, editors, Handbook of Comparative and Historical Indo-European Linguistics: An International Handbook (Handbücher zur Sprach- und Kommunikationswissenschaft [Handbooks of Linguistics and Communication Science]; 41.2), Berlin, Boston: De Gruyter Mouton, →ISBN, § The lexicon of Iranian, page 582: “PIE *peiH-os-”
↑ 8.08.1De Vaan, Michiel (2008) “pinguis”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 466
^ De Vaan, Michiel (2008) “opīmus”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, pages 429-430