Biswas, Indranil. “Orbifold Principal Bundles on an Elliptic Fibration and Parabolic Principal Bundles on a Riemann Surface, II”. Collectanea Mathematica, vol. 56, no. 3, Jan. 2005, pp. 235-52, https://raco.cat/index.php/CollectaneaMathematica/article/view/56595.