Industrial Engineering Chemistry, 1954, 46 (12), pp 2599–2604
Synthesis of Guanidine and Nitroguanidine - Interaction of Throurea or Ammonium Thiocyanate and Ammonia Interaction of Nitrourea and Gaseous or Liquid Ammonia
George W. Watt, Robert C. Makosky
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http://dx.doi.org/10.1021/ie50540a054