PHASE DIAGRAM OF THE TL2S–GA2S3 SYSTEM AND THE CRYSTAL STRUCTURE OF THE TL2GA20S31 COMPOUND Journal title: Праці Наукового товариства ім. Шевченка Authors: Oksana TSISAR, Lyudmyla PISKACH, Oleg PARASYUK, Anatoliy FEDORCHUK, Larysa MARUSHKO, Bogdan KOTUR Subject(s):