Voir la notice de l'article provenant de la source Annales Societatis Mathematicae Polonae Series
@article{10_14708_wm_v2i2_2740, author = {J. Mikusi\'nski}, title = {Trygonometria r\'ownania r\'o\.zniczkowego x"' + x {\textemdash} 0}, journal = {Wiadomo\'sci Matematyczne}, pages = { 207--227}, publisher = {mathdoc}, volume = {2}, number = {2}, year = {1959}, doi = {10.14708/wm.v2i2.2740}, language = {pl}, url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v2i2.2740/} }
J. Mikusiński. Trygonometria równania różniczkowego x"' + x — 0. Wiadomości Matematyczne, Tome 2 (1959) no. 2, pp. 207-227. doi : 10.14708/wm.v2i2.2740. http://geodesic.mathdoc.fr/articles/10.14708/wm.v2i2.2740/
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