TY  - BOOK
AU  - Ball (J M) Ed.
TI  - Systems of monlinear partial differential equations
T2  - ( NATOASI  Series : Advanced Science Institutes Series ) .. ( Mathematical and physical and physical sciences .111)
U1  - B334, M3 
PY  - 1983///
CY  - Dordrecht
PB  - Reidel Publishing      
ER  -