by MARVOLA, M.L.A, PIPPURI, A.K, MARTTILA, E.V, HONKANEN, E.J, KAIRISALO, P.J, UOTILA, J.A
Year of Publication 31.08.1987

by A.K. PIPPURI, P.J. JAIRISALO, E.J. HONKANEN, E.V. MARTTILA, J.A. UOTILA, M.L.A. MARVOLA
Year of Publication 16.04.1985