May 1, 2021 GLOTTOMETRICS (383) Happy Birthday Glottometrics – On the Occasion of the 50th Issue and 20th Anniversary Emmerich Kelih, Radek Čech, Jan Mačutek GLOTTOMETRICSIssue 50, pp 1-3 (2021)https://doi.org/10.53482/383 PDF Article Editorial Note