Erfang, Shan, Liying, Kang, Qin, Lu. K-semikernels, k-quasikernels, k-kernels in digraphs and their line digraphs. A Canadian journal of applied mathematics, computer science and statistics [Internet]. 2007 May 9 [cited 2026 May 8];72. Available from: https://utilitasmathematica.com/index.php/Index/article/view/502