Voir la notice de l'article provenant de la source Mathematicac Balkanica website
@article{MABA_2001_15_1-2_a7, author = {R. Semerdjieva}, title = {On a {Class} of {Hyperbolic} {Equations} with {Order} {Degeneration}}, journal = {Mathematica balkanica}, pages = {75}, publisher = {mathdoc}, volume = {15}, number = {1-2}, year = {2001}, url = {http://geodesic.mathdoc.fr/item/MABA_2001_15_1-2_a7/} }
R. Semerdjieva. On a Class of Hyperbolic Equations with Order Degeneration. Mathematica balkanica, Tome 15 (2001) no. 1-2, p. 75. http://geodesic.mathdoc.fr/item/MABA_2001_15_1-2_a7/