Research trend on erbium-doped tellurite glasses based on scopus database Mukhayyarotin Niswati Rodliyatul Jauhariyah, Mita Anggaryani and Ahmad Marzuki E3S Web Conf., 328 (2021) 04018 Published online: 06 December 2021 DOI: 10.1051/e3sconf/202132804018