BerezanskyY. M.; VereikinaM. B.; KolyadaS. F.; RomanenkoO. Y.; SivakA. G.; FedorenkoV. V. Aleksandr Nikolaevich Sharkovsky (on his 60th birthday). Ukrains’kyi Matematychnyi Zhurnal, v. 48, n. 12, p. 1602-1603, 25 Dec. 1996.