1. E. A. Antonova, Candidate’s dissertation, Leningr. Tekhnol. Inst. im. Lensoveta (1954).
2. M. S. Aslanova, Doctoral dissertation, Moscow (1955).
3. A. A. Appen and Kan Fu-hsi, Fiz. Tverd. Tela 1:1529 (1959).
4. A. A. Appen, Doctoral dissertation, Leningr. Tekhnol. Inst. im. Lensoveta (1952).
5. A. A. Appen and R. I. Bresker, Zh. Tekhn. Fiz. 22:946 (1952).