On a Liouville transformation for ux⁢x+uy⁢y±a2⁢x,y⁢u=0.
Bellman, Richard
Bollettino dell'Unione Matematica Italiana, Tome 13 (1958), p. 535-538 / Harvested from Biblioteca Digitale Italiana di Matematica
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Publié le : 1958-12-01
@article{BUMI_1958_3_13_4_535_0,
     author = {Richard Bellman},
     title = {On a Liouville transformation for $u\_{xx} + u\_{yy} \pm  a^{2}(x,y)u=0$.},
     journal = {Bollettino dell'Unione Matematica Italiana},
     volume = {13},
     year = {1958},
     pages = {535-538},
     zbl = {0087.09601},
     mrnumber = {100712},
     language = {en},
     url = {http://dml.mathdoc.fr/item/BUMI_1958_3_13_4_535_0}
}

Bellman, Richard. On a Liouville transformation for $u_{xx} + u_{yy} \pm  a^{2}(x,y)u=0$.. Bollettino dell'Unione Matematica Italiana, Tome 13 (1958) pp. 535-538. http://gdmltest.u-ga.fr/item/BUMI_1958_3_13_4_535_0/

[1] Bellman, R., Stability Theory of Differential Equations, McGrraw-Hill Book Company, Inc., New York, 1954. | MR 61235 | Zbl 0053.24705