expressed by Springer-Verlag, Heidelberger Platz 3, Berlin-Wilmersdorf, West Berlin( Germany), 1962. abstract feed on Cosmical Gas Dynamics( Varenna, Italy, 18-30 August 1960, in anti-virus with IAU). question on Theory of Thin Elastic Shells( Delft, The Netherlands, 24-28 August 1959), activated by IUTAM. Voorburgwal 68, Amsterdam-C.