@article{120069, author = {Irena Rach\r unkov\'a}, title = {Algebraic properties of phases of the differential equation $y'=q(t)y$}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {17}, year = {1978}, pages = {69-76}, zbl = {0423.34013}, mrnumber = {0554038}, language = {en}, url = {http://dml.mathdoc.fr/item/120069} }
Rachůnková, Irena. Algebraic properties of phases of the differential equation $y'=q(t)y$. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 17 (1978) pp. 69-76. http://gdmltest.u-ga.fr/item/120069/
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