Mikova, L., I. Virgala, M. Kelemen, T. Liptak, and D. Hroncova. “Micromachine for Locomotion Inside Pipe ”. Communications - Scientific Letters of the University of Zilina, Vol. 20, no. 1, Mar. 2018, pp. 55-60, http://journals.uniza.sk/index.php/communications/article/view/46.