On the wellposedness in the Gevrey classes of the Cauchy problem for weakly hyperbolic equations whose coefficients are Hölder continuous in t and degenerate in t=T
Rendiconti del Seminario Matematico della Università di Padova, Tome 100 (1998), pp. 81-96 
@article{RSMUP_1998__100__81_0,
     author = {Kinoshita, Tamotu},
     title = {On the wellposedness in the {Gevrey} classes of the {Cauchy} problem for weakly hyperbolic equations whose coefficients are {H\"older} continuous in $t$ and degenerate in $t = T$},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {81--96},
     year = {1998},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {100},
     mrnumber = {1675255},
     zbl = {0927.35055},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1998__100__81_0/}
}
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Kinoshita, Tamotu. On the wellposedness in the Gevrey classes of the Cauchy problem for weakly hyperbolic equations whose coefficients are Hölder continuous in $t$ and degenerate in $t = T$. Rendiconti del Seminario Matematico della Università di Padova, Tome 100 (1998), pp. 81-96. https://www.numdam.org/item/RSMUP_1998__100__81_0/

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