Circular economy: barrier and opportunities for SMEs Ni Putu Santi Suryantini, I Wayan Edi Arsawan, Ni Putu Ayu Darmayanti, Svitlana Moskalenko and Tetiana Gorokhova E3S Web Conf., 255 (2021) 01017 Published online: 03 May 2021 DOI: 10.1051/e3sconf/202125501017