Whenever youuse our catalogs, either in printed or in electronic form, please give complete references
Samus N.N., Durlevich O.V., Goranskij V.P., Kazarovets E. V., Kireeva N.N., Pastukhova E.N., Zharova A.V., General Catalogue of Variable Stars (Samus+ 2007-2015),   VizieR On-line Data Catalog: B/gcvs
in your papers