title: Theoretical determination of molecular structure and conformation.  20.  Reevaluation of the strain energies of cyclopropane and cyclobutane carbon-carbon and carbon-hydrogen bond energies, 1,3 interactions, and .sigma.-aromaticity.
authors.forename: D
authors.initials: D
authors.lastname: Cremer
authors.forename: J
authors.initials: J
authors.lastname: Gauss