$a New instrumentation for space astronomy : proceedings of a symposium of the Twentieth Plenary Meeting of COSPAR, Tel Aviv, Israel, 7-18 June 1977 / ed. by K. A. Van der Hucht and G. Vaiana. - Oxford, cop. 1978. $b CIP LCC (Hucht, K. A. van der) ; (Space Research Laboratory, Utrecht, The Netherlands)