@article{TMF_1973_15_3_a2,
     author = {W. Timmerman and G. Lassner},
     title = {On the essential self-adjointness of various algebras of field operators},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {311--314},
     year = {1973},
     volume = {15},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_15_3_a2/}
}