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Discovery of four periodic methanol masers and updated light curve for a further one
We report the discovery of 6.7 GHz methanol maser periodic flares in four massive star-forming regions and the updated light curve for the known periodic source G22.357+0.066. The observations were carried out with the Torun 32-m radio telescope between 2009 June and 2014 April. Flux density variations with period of …