Detection of periodic flares in 6.7 GHz methanol masers G45.804−0.356 and G49.043−1.079 M. Olech, M. Durjasz, M. Szymczak and A. Bartkiewicz A&A, 661 (2022) A114 Published online: 24 May 2022 DOI: 10.1051/0004-6361/202243108