TY  - BOOK
AU  - Gramchev Todor V
AU  - Popivanov Petar R
TI  - Partial differential equations: approximate solutions in scales of functional spaces
SN  - 3-527-40138-5
U1  - 515.353 
PY  - 2000///
CY  - Berlin
PB  - Wiley-VCH
KW  - Partial differential equations
ER  -