TY  - BOOK
AU  - Martini,R (ed)
TI  - Geometrical approaches to differential equations: proceedings of the 4th scheveningen conference, The Netherlands, aug 26-31, 1979
T2  - Lecture notes in mathematics 810
SN  - 3540100180
U1  - 10.01 
PY  - 1980///
CY  - Berlin
PB  - Springer
ER  -