APA (7th ed.) Citation

My, N. X., & Sendov, B. (1991). Mathematica Balkanica. New series. Vol. 5. 1991. Fasc. 1. Bulgarian Academy of Sciences.

Chicago Style (17th ed.) Citation

My, Nguen Xuan, and B. Sendov. Mathematica Balkanica. New Series. Vol. 5. 1991. Fasc. 1. Sofia: Bulgarian Academy of Sciences, 1991.

MLA (9th ed.) Citation

My, Nguen Xuan, and B. Sendov. Mathematica Balkanica. New Series. Vol. 5. 1991. Fasc. 1. Bulgarian Academy of Sciences, 1991.