1. F. L. Chernous’ko, “Motion of a Body with Mobile Internal Mass,” Dokl. Phys. 405(1), 56–60 (2005).
2. F. L. Chernous’ko, “Analysis and Optimization of the Motion of a Body Controlled by Means of a Movable Internal Mass,” Prikl. Mat. Mekh. 70(6), 915–941 (2006).
3. F. L. Chernous’ko, “The Optimal Periodic Motions of a Two-Mass System in a Resistant Medium,” Prikl. Mat. Mekh. 72(2), 202–215 (2008).
4. N. N. Bolotnik and T. Yu. Figurina, “Optimal Control of Rectilinear Motion of a Rigid Body on a Rough Surface by Means of Displacement of Two Internal Masses,” Prikl. Mat. Mekh. 72(2), 216–229 (2008).
5. A. G. Egorov and O. S. Zakharova, “The Motion of a Vibration-Driven Robot in a Resistant Medium Optimal with Respect to the Energy Consumption,” Prikl. Mat. Mekh. 74(4), 620–632 (2010).