TY  - BOOK
TI  - Perturbation methods for differential equations 
SN  - 0817641890 (alk. paper) | 3764341890 (alk. paper)
PY  - 2003///
CY  - Boston
PB  - Birkhäuser
UR  - http://www.loc.gov/catdir/enhancements/fy0812/2002066657-d.html | http://www.loc.gov/catdir/enhancements/fy0812/2002066657-t.html
ER  -