Shefer V. A. Vladimir Aleksandrovich & Shefer O. V. Olga Vladimirovna. (2016). On the accuracy of approximation of motion of a small celestial body by intermediate perturbed orbits calculated on the basis of three position vectors and three observations; Solar System Research; Vol. 50, iss. 3. 2016. https://doi.org/10.1134/S0038094616030060

Shefer V. A. Vladimir Aleksandrovich and Shefer O. V. Olga Vladimirovna. On the Accuracy of Approximation of Motion of a Small Celestial Body by Intermediate Perturbed Orbits Calculated on the Basis of Three Position Vectors and Three Observations; Solar System Research; Vol. 50, Iss. 3. 2016, 2016. https://doi.org/10.1134/S0038094616030060.

Shefer V. A. Vladimir Aleksandrovich and Shefer O. V. Olga Vladimirovna. On the Accuracy of Approximation of Motion of a Small Celestial Body by Intermediate Perturbed Orbits Calculated on the Basis of Three Position Vectors and Three Observations; Solar System Research; Vol. 50, Iss. 3. 2016, 2016. https://doi.org/10.1134/S0038094616030060.