Heterocycles from α‐Aminonitriles - Otto - 2014 - Chemistry – A European Journal - Wiley Online Library
File:Bucherer–Bergs mechanism.png - Wikipedia
Bucherer-Bergs reaction - wikidoc
Connective synthesis of 5,5-disubstituted hydantoins by tandem α-amination and α-arylation of silyl ketene acetals - Chemical Science (RSC Publishing) DOI:10.1039/C8SC05263H