Ballantyne, R.M. , Clegg, C.T., Rae , J.J., and Lawford, F.A.: Ammonia Production in Saliva, J. D. Res. 30: 385, 1951.
2.
Ballantyne, B.M. , Rae, J.J., and Lawford, F.H.: Ammonia Production and Urease Activity in Saliva, J. D. Res. 31: 281, 1952.
3.
Folin, O., and Bell, R.D.: Application of a New Reagent for the Separation of Ammonia. I. The Colorimetrie Determination of Ammonia in Urine. J. Biol. Chem . 29: 329, 317, 1917.