Preliminary results of dating for the Lower Paleolitic sites of Ukraine (Medzhibozh 1 and Medzhibozh A, Khmelnitskii region) by electron spin resonance method - D. K. Chej; B. A.B. Blekvell; I. K. Singkh; V. N. Stepanchuk; D. A.B. Blikstejn; D. A. Florentin; E. R. Skinner (Geophysical journal, 2018)