no. 2
On the regularity of the variational solution of the Tricomi problem in the elliptic region
ESAIM: Modélisation mathématique et analyse numérique, Tome 19 (1985) no. 2, pp. 327-340 
@article{M2AN_1985__19_2_327_0,
     author = {Vanninathan, M. and Veerappa Gowda, G. D.},
     title = {On the regularity of the variational solution of the {Tricomi} problem in the elliptic region},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {327--340},
     year = {1985},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {19},
     number = {2},
     mrnumber = {802598},
     zbl = {0573.35067},
     language = {en},
     url = {https://www.numdam.org/item/M2AN_1985__19_2_327_0/}
}
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Vanninathan, M.; Veerappa Gowda, G. D. On the regularity of the variational solution of the Tricomi problem in the elliptic region. ESAIM: Modélisation mathématique et analyse numérique, Tome 19 (1985) no. 2, pp. 327-340. https://www.numdam.org/item/M2AN_1985__19_2_327_0/

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