Antipov, N. V., V. A. Golovko, and A. F. Sinev. “THE MORPHOLOGICAL CHARACTERISTICS OF THE SINOAURICULAR AND AURICULO-VENTRICULAR NODES IN MOOSE, CATTLE, PIG, AND HUMAN HEARTS”. Alces: A Journal Devoted to the Biology and Management of Moose, Jan. 2002, pp. 7-10, https://www.alcesjournal.org/index.php/alces/article/view/1817.