@article{RSMUP_1979__61__221_0,
     author = {Bressan, A.},
     title = {On wave functions in quantum mechanics},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {221--228},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {61},
     year = {1979},
     mrnumber = {569661},
     zbl = {0456.35077},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1979__61__221_0/}
}