BerezanskyY. M., VereikinaM. B., KolyadaS. F., RomanenkoO. Y., SivakA. G., and FedorenkoV. V., “Aleksandr Nikolaevich Sharkovsky (on his 60th birthday)”, Ukr. Mat. Zhurn., vol. 48, no. 12, pp. 1602-1603, Dec. 1996.