This is quite interesting while the webpage itself is obviously unreliable the actual document being cited doesn t appear to have been produced by the same people responsible for the page rather judging by the formatting and citations it seems to be a chapter from a book or a journal article of some sort that has merely been uploaded there Unfortunately I don t have the expertise to determine whether Lopukhovsky Kavalerchik are a reliable source in their own right while they certainly don t have the name recognition that Krivosheev does they have written what appear to be actual non self published books e g and may thus be a legitimate alternative viewpoint to be considered My suggestion would be to ask for assistance on evaluating these authors at WT MILHIST and or WP RSN perhaps someone who edits more on this topic will have more insight into whether they re serious historians talk