00330nam a2200121Ia 4500008004100000082001600041100002200057245003900079250001200118260004300130300000800173650002700181230106s9999    xx            000 0 und d  a621.3bKI-E  aKirchmayer,Leon K 0aEconomic operation of power system  a1st Ed.  aNew DelhibWiley Eastern Limitedc1958  a260  aElectrical Engineering