Golovashkin A.I. ,     Mitsen K.V. ,     Ivanenko O.M. ,     Pavlovskii A.I. ,     Kolokolchikov N.P. ,     Platonov V.V. ,     Tatsenko O.M. ,     Derjugin Y.N. The measurements of upper critical magnetic field in YBCO. Intern. conf. on macroscopic quantum phenomena (Smolyanice, Czehoslovakia, 18-20 Sept. 1989) , с. P.183-185   Golovashkin A.I. ,     Mitsen K.V. ,     Ivanenko O.M. ,     Pavlovskii A.I. ,     Kolokolchikov N.P. ,     Platonov V.V. ,     Tatsenko O.M. ,     Derjugin Y.N. Destruction of superconductivity in YBa_2Cu_3O_7-x ceramics by ultrahigh magnetic field. Physica C: Superconductivity , Vol.162-164.Pt.II , с. C.1659-1660 , 01.1989