Vol. 836. García, P. L.; Pérez-Rendón, A.; Souriau, J. M. (Eds.) 
Differential Geometrical Methods in Mathematical Physics: Proceedings of the Conferences held at Aix-en-Provence, September 3-7, 1979 and Salamanca, September 10-14, 1979 
QC20.7D52 D54 1979