sentences:  Danylenko's magnum opus about the site was released posthumously, but it took the publication of Anatoly Kifishin's hefty monograph in 2001 to attract wider attention to Kamenna Mohyla.In this controversial work, Kifishin compared the petroglyphs of Kamenna Mohyla to those of Çatalhöyük and concluded that both were related to the Sumerian cuneiform script.Shortly before his death, Igor Diakonov lashed out against Kifishin's hypothesis (the two openly feuded since the 1960s).