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- [29] PHOSPHORUS-NITROGEN COMPOUNDS .31. NEW 4-MEMBERED RING SYSTEMS WITH NITROGEN, PHOSPHORUS AND CARBON IN RING ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 1970, 372 (03): : 285 - +
- [30] CONTRIBUTIONS TO CHEMISTRY OF BORON .68. CYCLIC COMPOUNDS WITH BORON, NITROGEN, AND PHOSPHORUS AS RING MEMBERS (PHOSPHABORAZINES) CHEMISCHE BERICHTE-RECUEIL, 1974, 107 (12): : 3806 - 3817