1. Shmidt VS (1980) Ekstraktsiya aminami. Atomizdat, Moskva
2. Khol'kin AI, Kuzmin VI (1984) In: Khimiya ekstraktsii. Nauka, Novosibirsk, pp 53–68
3. Patent SSSR No. 833940, Bull izobr N 20, 1981
4. Patent SSSR No. 702003, Bull izobr N 45, 1979
5. Rakhman'ko EM, Starobinets GL, Leshchev SM (1979) Zh Anal Khim 34:2244–2247