THE SYSTEM (NH4)2HPO4-NH4H2PO4-(NH4)2S2O8-H2O

[11] KELMAN FN, 1965, METODY ANAL KONTROLE

[12] Polosin V. A., 1953, ZH FIZ KHIM, V27, P57

[13] PUSTYLNIK EM, 1968, STATISTICHESKIE METO, P96

[14] SLUTSKAYA L. D., 1972, Agrokhimiya, P130

[15] VINNIK MM, 1975, METODY ANAL FOSFATNO, P155

[11] KELMAN FN, 1965, METODY ANAL KONTROLE

[12] Polosin V. A., 1953, ZH FIZ KHIM, V27, P57

[13] PUSTYLNIK EM, 1968, STATISTICHESKIE METO, P96

[14] SLUTSKAYA L. D., 1972, Agrokhimiya, P130

[15] VINNIK MM, 1975, METODY ANAL FOSFATNO, P155