00382nam a2200109Ia 4500008004100000040003800041100002000079245009800099260004500197300001500242653001500257211215s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aElderfield, R C 0aHeterocyclic compounds vol viii: tetrazoles, tetrazines, and purines and related ring systems  bJohn Wiely and Sons, IncaNew Yorkc1967  avii,462 p.  aChemistry,