a person in the record
Grigorii Aristidovich Derfel
Doctoral advisors on Wikidata: Valentina Borok and Yakov Zhitomirsky.
Advisors on Wikidata
Wikidata's own statements of who supervised whom, kept apart from the record's theses and never counted with them.
Wikidata run graph-wikidata-20261015T220004Z