1. Studies on organophosphorus compounds—XLI
2. The chemistry of heterocyclic compounds: pyrazolinones, pyrazolidones and derivatives,1964
3. Joerg S, Reinhold G, Otto S, Joachim SH, Robert S, Klaus L. Ger Offen 04 Feb 1988, DE3, 625, 686 (ClC07D 231/22). C.A. 1988, 108, 167465.