Continuous solutions of the problem of a string vibrating against an obstacle
Rendiconti del Seminario Matematico della Università di Padova, Tome 59 (1978), pp. 67-96. 
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     author = {Amerio, Luigi},
     title = {Continuous solutions of the problem of a string vibrating against an obstacle},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {67--96},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {59},
     year = {1978},
     zbl = {0423.73046},
     mrnumber = {547080},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1978__59__67_0/}
}
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Amerio, Luigi. Continuous solutions of the problem of a string vibrating against an obstacle. Rendiconti del Seminario Matematico della Università di Padova, Tome 59 (1978), pp. 67-96. http://www.numdam.org/item/RSMUP_1978__59__67_0/

[1] L. Amerio - G. PROUSE, Study of the motion of a string vibrating against an obstacle, Rend. di Mat., (2), vol. 8, serie VI, 1975. | MR 388902 | Zbl 0327.73071