Optical Identifications of Five INTEGRAL Hard X-ray Sources in the   Galactic Plane Region
  The results of optical identifications of five hard X-ray sources in the Galactic plane region from the INTEGRAL all-sky survey are presented. The X-ray data on one source (IGRJ20216+4359) are published for the first time. The optical observations were performed with 1.5-m RTT-150 telescope (TUBITAK National Observatory, Antalya, Turkey) and 6-m BTA telescope (Special Astrophysical Observatory, Nizhny Arkhyz, Russia). A blazar, three Seyfert galaxies, and a high-mass X-ray binary are among the identified sources. 
I. F. Bikmaev, R. A. Burenin, M. G. Revnivtsev, S. Yu. Sazonov, R. A.   Sunyaev, M. N. Pavlinsky, N. A. Sakhibullin