Bartha, Miklós, and Miklós Krész. “Splitters and Barriers in Open Graphs Having a Perfect Internal Matching”. Acta Cybernetica 18, no. 4 (January 1, 2008): 697–718. Accessed April 2, 2025. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3746.