Zhu, L. Y., S. B. Qian, E.-G. Zhao, E. Fernández Lajús, and Z.-T. Han. “Close-In Substellar Companions and the Formation of SdB-Type Close Binary Stars”. Acta Polytechnica CTU Proceedings, vol. 2, no. 1, Feb. 2015, pp. 183-7, doi:10.14311/APP.2015.02.0183.