APA (7th ed.) Citation

Gál, T., Kruse, H., & Zörnig, P. (1987). Survey of solved and open problems in the degeneracy phenomenon.

Chicago Style (17th ed.) Citation

Gál, Tomáš, Hermann-Josef Kruse, and Peter Zörnig. Survey of Solved and Open Problems in the Degeneracy Phenomenon. Hagen, 1987.

MLA (9th ed.) Citation

Gál, Tomáš, et al. Survey of Solved and Open Problems in the Degeneracy Phenomenon. 1987.