The spectroscopic evolution of the recurrent nova T Pyxidis during its 2011 outburst - I. The optically thick phase and the origin of moving lines in novaeS. N. Shore, T. Augusteijn, A. Ederoclite and H. UthasA&A, 533 (2011) L8DOI: https://doi.org/10.1051/0004-6361/201117721
