TY  - BOOK
AU  - Kaumpera, A. and Spencer, D. C.
AU  - Spencer, D. C. ; jt. auth.
TI  - Systems of linear partial differential equations and deformation of pseudogroup structures
T2  - University of Montreal, seminaire de Mathematiques superieures-ETE 1969
U1  - 515.35 
PY  - 1974///
CY  - Montreal
PB  - Universite de Montreal
ER  -