TY  - BOOK
AU  - Herrera Ismael
TI  - Boundary methods: an algebraic theory
T2  - Applicable mathematics series
U1  - B33:1, M4 
PY  - 1984///
CY  - London
PB  - Pitman         
KW  -  Approximation theory
KW  - Boundary value problems
ER  -