1) JOC, V.51 (1986) №19 pp 3572 - 3576
Synthetic applications of the 1-cyclobutenyltriphenylphosphonium salt. Synthesis and reactions of 1,2-difunctionalized cyclobutanes
Toru Minami, Nobuo Harui, and Yuki Taniguchi
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http://dx.doi.org/10.1021/jo00369a0032) JOC, V.45 (1980) №21 pp 4183 - 4193;
Strained aromatic systems. Synthesis of cyclopropabenzocyclobutenes, cyclopropanaphthocylobutenes, and related compounds
Dariush Davalian, Peter J. Garratt, Wolfgang Koller, and Muzammil M. Mansuri
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http://dx.doi.org/10.1021/jo01309a0243) Tetrahedron Letters, Volume 20, Issue 25, 1979, Pages 2351-2352
Trimethylencyclobutan
Hans-Dieter Martin and Bernhard Mayer
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http://dx.doi.org/10.1016/S0040-4039(01)93970-X