1. Association of Official Analytical Chemists. 1975. Official methods of analyses. 12th edition. Washington, DC.
2. Formalin-treated skim milk for pigs;Barber;J. Minist. Agr.,1956
3. Modified reagents for determination of urea and ammonia;Chaney;Clin. Chem.,1962
4. Evans, W. M. R., and T. W. Vale. 1960. The rearing of calves on skim milk containing formalin. Exp. Husb. Minist. Agr. Fish Food. No. 5:66.
5. Effects of formalin added to milk replacers on growth, feed intake, digestion, and incidence of abomasal bloat in lambs;Gorrill;Can. J. Anim. Sci.,1975