Synthesis of New Bicyclic Oxazaphosphorine Analogues: 2-[Bis(2-chloroethyl)amino]-2-oxo-3-oxa-7-thia-1-aza-2-phosphabicyclo[4.4.0]decane and -[4.3.0]nonane - Schmidt, Brigitte F; Tang, Wei-Ci; Eisenbrand, Gerhard (Synthesis, 1992)