by [Stephenson, D.].
by [Scheidegger, Adrian E., 1925-].
by [Sharma P. V.].
by [Kezdi, A.].
by [Magara, Kinji].
by [Halek, Vaclav] | , Svec, Jan.
by , Cox, P. A., Westine, P. S., Kulesz, J. J., Strehlow, R. A.
by [Wieder, H. H.].
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