KARKI, R. K. Topological Order in Physics. Himalayan Physics, [S. l.], v. 6, p. 108–111, 2017. DOI: 10.3126/hj.v6i0.18372. Disponível em: https://www.nepjol.info/index.php/HP/article/view/18372. Acesso em: 9 dec. 2021.