APA (7th ed.) Citation

Wambsganß, J., Paczyński, B., & Katz, N. (1989). Micro-lensing model for QSO 2237+0305. Lecture notes in physics, 330(?), . https://doi.org/10.1007/3-540-51061-3_56

Chicago Style (17th ed.) Citation

Wambsganß, Joachim, Bohdan Paczyński, and Nick Katz. "Micro-lensing Model for QSO 2237+0305." Lecture Notes in Physics 330, no. ? (1989). https://doi.org/10.1007/3-540-51061-3_56.

MLA (9th ed.) Citation

Wambsganß, Joachim, et al. "Micro-lensing Model for QSO 2237+0305." Lecture Notes in Physics, vol. 330, no. ?, 1989, https://doi.org/10.1007/3-540-51061-3_56.