Gruenhage, Gary, Strashimir G. Popvassilev, and John E. Porter. “Monotone Orthocompactness and Property $(A_o)$”. Topology Proceedings 59 (April 26, 2021): 163–176. Accessed June 30, 2026. https://www.topologyproceedings.org/index.php/tp/article/view/39.