no. 3
A Cauchy problem for a semi-axially symmetric wave equation
Compositio Mathematica, Tome 23 (1971) no. 3, pp. 297-306 
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     author = {Young, Eutiquio C.},
     title = {A {Cauchy} problem for a semi-axially symmetric wave equation},
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     pages = {297--306},
     year = {1971},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {23},
     number = {3},
     mrnumber = {301370},
     zbl = {0224.35054},
     language = {en},
     url = {https://www.numdam.org/item/CM_1971__23_3_297_0/}
}
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Young, Eutiquio C. A Cauchy problem for a semi-axially symmetric wave equation. Compositio Mathematica, Tome 23 (1971) no. 3, pp. 297-306. https://www.numdam.org/item/CM_1971__23_3_297_0/

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