Calcium II infrared triplet line models in classical T Tauri starsR. Azevedo, N. Calvet, L. Hartmann, D. F. M. Folha, F. Gameiro and J. MuzerolleA&A, 456 1 (2006) 225-234DOI: https://doi.org/10.1051/0004-6361:20054315