@article{AIHPA_1988__48_4_333_0,
     author = {\^Ota, Sch\^oichi},
     title = {Unbounded representations of a $\ast $-algebra on indefinite metric space},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {333--353},
     publisher = {Gauthier-Villars},
     volume = {48},
     number = {4},
     year = {1988},
     mrnumber = {969171},
     zbl = {0673.46034},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1988__48_4_333_0/}
}