TY  - BOOK
AU  - Forsyth, Andrew Russell.
TI  - Theory of Differential Equations Part 1 :Exact Equations and PFaff`s Problem / 
U1  - B333 
PY  - 1994///
CY  - New York : 
PB  - Dover Publications, Inc , 
KW  - Mathematics <Differential Equations>
ER  -