http://vocabularios.caicyt.gov.ar/uat/ Unified Astronomy Thesaurus UAT UAT 2013-12-18 en 2013-12-18 17:18:16 Variable star period change 2013-12-18 17:18:16 Period variation Period-change Periodically variable Periodically-variable http://vocabularios.caicyt.gov.ar/uat/skos/369