R. Hudson, Harry, and Janis F Volckman. 2010. “The Preparation of α -Aminopropane Phosphonic Acid via the Catalyzed Hydrogenation of Dimethyl or Diethyl &Amp;#945;-Hydroxy-Imino-Propanephosphonate”. Periodica Polytechnica Chemical Engineering 54 (1):9-14. https://doi.org/10.3311/pp.ch.2010-1.02.