Andrei A. Tolmachev, Sergei I. Dovgopoly, Aleksandr N. Kostyuk, Ernest S. Kozlov, Aleksei O. Pushechnikov, Wolfgang Holzer
Synthesis and characterization of 4,5-dihydro-1H-pyrazolo[3,4b][1,4]azaphosphinines (p 391-398)
Heteroatom Chemistry 1999 Volume 10 Issue 5 , Pages 349 - 439
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http://dx.doi.org/10.1002/(SICI)1098-1071(1999)10:5<391::AID-HC9>3.0.CO;2-M