@article{ASUO_2018_XXVI_1_a9, author = {Furkan Semih D\"undar and Soley Ersoy and Nuno T. S\'a Pereira }, title = {Bobillier formula for the elliptical harmonic motion }, journal = {Analele Universit\u{a}\c{t}ii "Ovidius" Constan\c{t}a Seria Matematic\u{a}}, publisher = {mathdoc}, volume = {XXVI}, number = {1}, year = {2018}, url = {http://geodesic.mathdoc.fr/item/ASUO_2018_XXVI_1_a9/} }