APA (7th ed.) Citation

Ulrich, M., Heidt, J., & Wagner, S. (1992). Multiwavelength observations of the quasar Q 1821 + 643 during the ROSAT All Sky Survey. Astronomy and astrophysics, 266(1), .

Chicago Style (17th ed.) Citation

Ulrich, Marie-Helene, Jochen Heidt, and Stefan Wagner. "Multiwavelength Observations of the Quasar Q 1821 + 643 During the ROSAT All Sky Survey." Astronomy and Astrophysics 266, no. 1 (1992).

MLA (9th ed.) Citation

Ulrich, Marie-Helene, et al. "Multiwavelength Observations of the Quasar Q 1821 + 643 During the ROSAT All Sky Survey." Astronomy and Astrophysics, vol. 266, no. 1, 1992.