Volume 20 (1978-1979) no. 2
Table of contents
List of lectures
Talk no. 22, 20 p.
Talk no. 23, 5 p.
Talk no. 26, 7 p.
Talk no. 27, 15 p.
Talk no. 28, 11 p.
Talk no. 30, 4 p.
Talk no. 31, 9 p.
Talk no. 32, 19 p.
Talk no. 33, 1 p.
article no. 11, 56 p.
