1. M�ller A., Diemann E., Baumann F.-W. (1988) Nachr. Chem. Tech. Lab.36: 22; Chianelli R. R. (1984) Catal. Rev. Sci. Eng.26: 361
2. Nayak A. N., Manjappa S., Ramappa P. G., Yathirajan H. S. (1981) Fresenius' Z. Anal. Chem.309: 396
3. Tarayan V. M., Mirzoyan F. V., Sarkisyan Zh. V. (1979) Zavod. Lab.45: 409
4. Lazarev A. I., Lazarev V. I., Komarnaya V. D. (1976) Zavod. Lab.42: 1304
5. Jordanov N., Pavlova M., Stefanov S. (1978) Talanta25: 389