Question: Igor Yourievitch Osten-Sacken-Bogdanoff and Grichka Yourievitch Osten-Sacken-Bogdanoff, are French television producers and scientific essayists who since the 1970s, and were involved in a number of controversies, most notably the Bogdanov affair, an academic dispute regarding the legitimacy of a series of theoretical physics papers, and were alleged by their authors to culminate in a proposed theory for describing what occurred at which historic event?
Sentence (from "Igor and Grichka Bogdanoff"): Igor Yourievitch Osten-Sacken-Bogdanoff and Grichka Yourievitch Osten-Sacken-Bogdanoff, (or Bogdanov; born 29 August 1949) are French television producers and scientific essayists who since the 1970s have presented various subjects in science fiction, popular science and cosmology.
Relevant evidence: No