On the solution of Schrödinger-like wave equations
Rendiconti del Seminario Matematico della Università di Padova, Tome 42 (1969), pp. 329-340 
@article{RSMUP_1969__42__329_0,
     author = {de Graaf, J. and Peletier, L. A.},
     title = {On the solution of {Schr\"odinger-like} wave equations},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {329--340},
     year = {1969},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {42},
     mrnumber = {252864},
     zbl = {0234.35022},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1969__42__329_0/}
}
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de Graaf, J.; Peletier, L. A. On the solution of Schrödinger-like wave equations. Rendiconti del Seminario Matematico della Università di Padova, Tome 42 (1969), pp. 329-340. https://www.numdam.org/item/RSMUP_1969__42__329_0/

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