THE EFFECT OF FUSION OF ANGULAR STRAINED RINGS ON BENZENE - CRYSTAL-STRUCTURES OF 1,2-DIHYDROCYCLOBUTA[A]CYCLOPROPA[C]-, 1,2,3,4-TETRAHYDRODICYCLOBUTA[A,C]-, 1,2,3,4-TETRAHYDRODICYCLOBUTA[A,C]CYCLOPROPA[E]-, AND 1,2,3,4,5,6-HEXAHYDROTRICYCLOBUTA[A,C,E]BENZENE
R. Boese et al., THE EFFECT OF FUSION OF ANGULAR STRAINED RINGS ON BENZENE - CRYSTAL-STRUCTURES OF 1,2-DIHYDROCYCLOBUTA[A]CYCLOPROPA[C]-, 1,2,3,4-TETRAHYDRODICYCLOBUTA[A,C]-, 1,2,3,4-TETRAHYDRODICYCLOBUTA[A,C]CYCLOPROPA[E]-, AND 1,2,3,4,5,6-HEXAHYDROTRICYCLOBUTA[A,C,E]BENZENE, Angewandte Chemie, International Edition in English, 33(3), 1994, pp. 313-317