“Cauchy Problem for a Class of Totally Characteristic Hyperbolic Operators with Characteristics of Variable Multiplicity in Gevrey Classes”, J. Part. Diff. Eq., vol. 1, no. 1, pp. 31–41, Aug. 2018, Accessed: Dec. 06, 2025. [Online]. Available: https://global-sci.com/index.php/jpde/article/view/3590