1. Delsemme, A.H.: 1976, Lecture Notes in Phys. 48, pp. 314–318.
2. Hajduk, A.: 1970, Bull. Astron. Inst. Czechosl. 21, pp. 37–45.
3. Hajduk, A.: 1973, Bull. Astron. Inst. Czechosl. 24, pp. 9–13.
4. Hajduk, A.: 1980, IAU Symp. 90, pp. 149–152.
5. Hajduk, A., Cevolani, G.: 1981, Bull. Astron. Inst. Czechosl. 32, pp. 304–310.