7M Mohebbi-Fani, S Shekarforoosh, M Maleki, et al. Primary e- valuation of methenamine as a NPN compound with probable effects on increasing ruminal escaped protein[J]. J. Vet. Med. A. , 2002(49): 239.
9Bertram W Grlfflths, James E Logan. Determination of methe- namine and methenamine mandelate by nesslerization following dilute acid hydrolysis[J]. Anal Chem. , 1959(31) :1 8821 884.
10Charles A Gaglia, Jr. Leo A Gosser, Lester Chafetz. Methena mine mandelate assay procedures based on a 2:1 silver nitrate- methenamine complex[J]. Anal Chem. , 1972 (44): 1 690- 1 692.