Golovashkin A.I. ,     Mitsen K.V. ,     Ivanenko O.M. ,     Pavlovskii A.I. ,     Kolokolchikov N.P. ,     Platonov V.V. ,     Tatsenko O.M. ,     Deryugin Y.N. Destruction of superconductivity in YBa_2Cu_3O_7 ceramics by ultrahigh magnetic field. Intern. conf. on Superconductivity. Bangalore, India, 10-14 Jan. 1990 , с. P.302