Volume 20 (1978-1979) no. 1
Table of contents
List of lectures
Talk no. 2, 10 p.
Talk no. 3, 6 p.
Talk no. 5, 7 p.
Talk no. 6, 6 p.
Talk no. 8, 8 p.
Talk no. 9, 13 p.
Talk no. 11, 2 p.
Talk no. 12, 14 p.
Talk no. 13, 4 p.
Talk no. 14, 10 p.
Talk no. 15, 12 p.
Talk no. 17, 6 p.
Talk no. 18, 1 p.
