title: Heavy cyclopropenes of Si, Ge, and Sn--a new challenge in the chemistry of group 14 elements.
authors.affiliation: Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Sekiguchi
authors.forename: Vladimir Ya
authors.initials: VY
authors.lastname: Lee