R.Tykwinski, F. Diederich, P. Seiler, V. Gramlich. 1,1,2,2-Tetraethynylethanes: Synthons for Tetraethynylethenes and Modules for Acetylenic Molecular Scaffolding.
Helvetica Chimica Acta.- Vol. 79 Iss. 3, P. 634 – 645
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http://dx.doi.org/10.1002/hlca.19960790306
