Elsegood MR, Kelly PF, Reid G, Staniland PM. The first use of the free selenimide Ph2Se=NH as a synthon; the synthesis and X-ray crystal structure of [Ph2SeNSePh2][BPh4]. Dalton Trans. 2008 Aug 07;(29):3798–800. doi: 10.1039/b806066e. PMID: 18629400.