Prophet, M. P., and I. A. Shevchuk. 2012. “Shape-Preserving Projections in Low-Dimensional Settings and the <i>q </I&gt;-Monotone Case”. Ukrains’kyi Matematychnyi Zhurnal 64 (5), 674-84. https://umj.imath.kiev.ua/index.php/umj/article/view/2607.