@article{120265, author = {Ji\v r\'\i\ Zeman}, title = {On some continuities of phases theory and WKB method for linear differential equation of the second order}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {30}, year = {1991}, pages = {39-47}, zbl = {0752.34034}, mrnumber = {1166424}, language = {en}, url = {http://dml.mathdoc.fr/item/120265} }
Zeman, Jiří. On some continuities of phases theory and WKB method for linear differential equation of the second order. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 30 (1991) pp. 39-47. http://gdmltest.u-ga.fr/item/120265/
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