Variable stars in the Tycho photometric observations - I. DetectionS. Piquard, J.-L. Halbwachs, C. Fabricius, R. Geckeler, C. Soubiran and A. WicenecA&A, 373 2 (2001) 576-588DOI: https://doi.org/10.1051/0004-6361:20010603
