Boeskorov, Gennady, and Marina Shchelchkova. 2020. “Modern Studies of the Resources of Fossil Mammoth Tusks in the Arctic Zone of Yakutia (northeast Siberia, Russia)”. Amazonia Investiga 9 (25), 274-78. https://amazoniainvestiga.info/index.php/amazonia/article/view/1066.