den Hertog et al.
Recueil des Travaux Chimiques des Pays-Bas, 1951 , vol. 70, p. 591,598
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Kolder; den Hertog
Recueil des Travaux Chimiques des Pays-Bas, 1953 , vol. 72, p. 285,291
1: With sulfuric acid; sodium nitrite in water T=0 - 10°C; 0.25 h; 2: With tin(ll) chloride in water T=0 - 20°C; 0.5 h; 3: With ammonium hydroxide in water