TY  - BOOK
AU  - Gamma, Erich
AU  - Helm, Richard. Johnson, Ralph. Vlissides, john
TI  - Design Patterns :element of reusable object - criented software 
SN  - 0201633612
U1  - 005 . 1  
PY  - 2005///
CY  - london 
PB  - addison wesley 
KW  - design
N1  - Includes Index
ER  -