title: Interplay of EnE'3-nC valence isomers (E, E' = Si, Ge): bicyclo[1.1.0]butanes with very short bridging bonds and their isomerization to alkyl-substituted cyclopropenes.
authors.affiliation: Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Vladimir Ya
authors.initials: VY
authors.lastname: Lee
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yasuda
authors.forename: Akira
authors.initials: A
authors.lastname: Sekiguchi