SYNTHETIC BETA-LACTAM ANTIBIOTICS .1. SYNTHESIS AND ANTIBACTERIAL ACTIVITY OF 7-AMINO-3-[1-(HALO-SUBSTITUTED PHENYL)-1H-TETRAZOLE-5-YL]THIOMETHYL-3-CEPHEME-4-CARBOXYLIC ACIDS - KOH, D; PARK, SW; KIM, Y (KOREAN CHEMICAL SOC, 1987)