00345nam a2200121Ia 4500008004100000040001600041041001200057082001700069100001500086245008000101260002700181300001500208230917s9999||||xx |||||||||||||| ||und||  e86501aMAIN  aEnglish  a547.59 G959H  aGupta, R R 0aHeterocyclic Chemistry, v1-principles, three and four membered heterocycles  aBerlinbSpringerc1998  axi, 422 p.