An unusual very low-mass high-amplitude pre-main sequence periodic variableM. V. Rodríguez-Ledesma, R. Mundt, M. Ibrahimov, S. Messina, P. Parihar, F. V. Hessman, C. Alves de Oliveira and W. HerbstA&A, 544 (2012) A112DOI: https://doi.org/10.1051/0004-6361/201118649