@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},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {42},
     year = {1969},
     mrnumber = {252864},
     zbl = {0234.35022},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1969__42__329_0/}
}