TY - BOOK AU - Ausiello G AU - Crescenzi P AU - Gambosi G AU - Kann V AU - Marchetti-Spaccamela AU - Protasi M TI - Complexity and approximation: combinatorial optimization problems and their approximability properties SN - 3-540-65431-3 U1 - 519.3 PY - 1999/// CY - Berlin PB - Springer-Verlag KW - Combinatorial optimization ER -