Exhaustive exploration of the conformational landscape of mono- and disubstituted five-membered rings by DFT and MP2 calculations - RSC Advances (RSC Publishing) DOI:10.1039/C9RA03524A
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File:Buchner five membered ring expansion new.png - Wikimedia Commons
Stabilization of anti-aromatic and strained five-membered rings with a transition metal | Nature Chemistry
Enantioselective Synthesis of Five-Membered-Ring Atropisomers with a Chiral Rh(III) Complex | Organic Letters