TY  - BOOK
AU  - Aubert,K.E & Ljunggren,W
ED  - Ljunggren, W
TI  - Proceedings of the 15th Scandinavian Congress, Oslo,1968
T2  - Lecture notes in mathematics 118
U1  - 22 
PY  - 1970///
CY  - Berlin
PB  - Springer
ER  -