Zverkova, T. S., V. A. Plotnikov, and O. E. Slobodyanyuk. 1994. “Averaging of Aperiodic Problems of Control over Fracture Surfaces”. Ukrains’kyi Matematychnyi Zhurnal 46 (10): 1388–1392. https://umj.imath.kiev.ua/index.php/umj/article/view/5618.