Asplund, M. Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;
Kiselman, D., Pereira, T. M. D., Gustafsson, B., Asplund, M., Meléndez, J., & Langhans, K. (2011). Is the solar spectrum latitude-dependent? An investigation with SST/TRIPPEL. Astronomy & Astrophysics, 535: A14, pp. 1-9. doi:10.1051/0004-6361/201117553.