Dmyro Yakovich Petryna (the 80th Anniversary) - Ye. D. Bilokolos; V. I. Herasymenko; M. L. Horbachuk; A. H. Zahorodnii; A. H. Nikitin; O. L. Rebenko; A. M. Samoilenk (Transactions of Institute of Mathematics, the NAS of Ukraine, 2014)