by Jacobi, Ch, Portnyagin, Yu.I., Solovjova, T.V., Hoffmann, P., Singer, W., Kashcheyev, B.L., Oleynikov, A.N., Fahrutdinova, A.N., Solntsev, R.N., Beard, A.G., Mitchell, N.J., Muller, H.G., Schminder, R., Kürschner, D.
Published in Advances in space research (01.01.1999)