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“The Exterior Tricomi and Frankl Problems for Quaterelliptic-Quaterhyperbolic Equations with Eight Parabolic Lines”,
Eur. J. Pure Appl. Math., vol. 4, no. 2, pp. 186–208, May 2011, Accessed: Nov. 21, 2024. [Online]. Available:
https://www.ejpam.com/index.php/ejpam/article/view/1175