Golovashkin A.I. ,     Mitsen K.V. ,     Gorelik V.S. ,     Ivanova L.I. ,     Rusakov A.P. ,     Phaizullov T.P. ,     Anshuokova N.V. The properties of Ba_1-xK_xBiO_3 high-temperatures superconductors at different potassium concentrations. Physica C: Superconductivity , Vol.162-164.Pt.II , с. C.1657-1658 , 01.1989