Xu, Shuaijianni; Zhang, Liang Feng: 'Cryptanalysis of Morillo–Obrador polynomial delegation schemes', IET Information Security, 2018, 12, (2), p. 127-132, DOI: 10.1049/iet-ifs.2017.0259
IET Digital Library, https://digital-library.theiet.org/;jsessionid=e449y1hqd4rg.x-iet-live-01content/journals/10.1049/iet-ifs.2017.0259