@article{ASNSP_1978_4_5_1_105_0,
     author = {Kato, Tosio},
     title = {On some {Schr\"odinger} operators with a singular complex potential},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {105--114},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 5},
     number = {1},
     year = {1978},
     mrnumber = {492961},
     zbl = {0376.47021},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1978_4_5_1_105_0/}
}