Cite
LTE or non-LTE, that is the question The NLTE chemical evolution of strontium in extremely metal-poor stars.
MLA
Hansen, C. J., et al. “LTE or Non-LTE, That Is the Question The NLTE Chemical Evolution of Strontium in Extremely Metal-Poor Stars.” Astronomy & Astrophysics / Astronomie et Astrophysique, vol. 551, Mar. 2013, pp. 1–13. EBSCOhost, https://doi.org/10.1051/0004-6361/201220584.
APA
Hansen, C. J., Bergemann, M., Cescutti, G., François, P., Arcones, A., Karakas, A. I., Lind, K., & Chiappini, C. (2013). LTE or non-LTE, that is the question The NLTE chemical evolution of strontium in extremely metal-poor stars. Astronomy & Astrophysics / Astronomie et Astrophysique, 551, 1–13. https://doi.org/10.1051/0004-6361/201220584
Chicago
Hansen, C. J., M. Bergemann, G. Cescutti, P. François, A. Arcones, A. I. Karakas, K. Lind, and C. Chiappini. 2013. “LTE or Non-LTE, That Is the Question The NLTE Chemical Evolution of Strontium in Extremely Metal-Poor Stars.” Astronomy & Astrophysics / Astronomie et Astrophysique 551 (March): 1–13. doi:10.1051/0004-6361/201220584.