1. Aminov, M. S., Equations of motion of a system of material points of variable mass in group variables. Trudy Kazan. Aviacion. Inst. Vyp. 80, 5–11 (1963).
2. Četaev, N. G., On the equations of Poincaré. J. Appl. Math. Mech. [Akad. Nauk SSS R. Zhurnal Prikl. Mat. Mech.] 5, 253–262 (1941).
3. Ghori, Q. K., & M. Hussain, Poincaré's equations for nonholonomoic dynamical systems. Zeitschrift für Angewandte Mathematik und Mechanik 53-7, 391–396 (1973).
4. Guen, Fam., On the equations of motion of nonholonomic mechanical systems in Poincaré-Četaev variables. Prikl. Mat. Meh. 31, 253–259 (1967); translated in J. Appl. Math. Mech. 31, 274–281 (1967).
5. Poincaré, H., Sur une forme nouvelle des équations de la mécanique. Compt. Rend. Acad. Sci. T. 132, 369–371 (1901).