TY  - BOOK
AU  - Johnson, R.S.
TI  - An introduction to partial differential equations
SN  - 9788776819699
PY  - 2015///
PB  - Bookboon.com
KW  - SOIL CONTENT ANALYSIS
KW  - DIFFERENTIAL EQUATIONS
UR  - http://opac.lib.ruh.ac.lk/cgi-bin/koha/opac-retrieve-file.pl?id=8d27fb70d971c5772cd146af41bb39f3
ER  -