An unusual very low-mass high-amplitude pre-main sequence periodic variable M. V. Rodríguez-Ledesma, R. Mundt, M. Ibrahimov, S. Messina, P. Parihar, F. V. Hessman, C. Alves de Oliveira and W. Herbst A&A, 544 (2012) A112 Published online: 08 August 2012 DOI: 10.1051/0004-6361/201118649