1. Chr. Boyadjiev,Inzh.-Fiz. Zh.,59, No. 1, 92?98 (1990).
2. Chr. Boyadjiev,Int. Chem. Eng.,11, No. 3, 470?474 (1971).
3. Chr. Boyadjiev,Int. Chem. Eng.,11, No. 3, 457?464 (1971).
4. Chr. Boyadjiev and L. Velchev,Teor. Osn. Khim. Tekhn.,5, 912?915 (1971).
5. Chr. Boyadjiev and Pl. Mitev,Chem. Eng. J.,14, 225?228 (1977).