@article{10_4153_CJM_1973_046_5,
     author = {Leviatan, Talma},
     title = {Creation of {Mass} {Processes} and {Perturbation} {Theory}},
     journal = {Canadian journal of mathematics},
     pages = {456--467},
     year = {1973},
     volume = {25},
     number = {3},
     doi = {10.4153/CJM-1973-046-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1973-046-5/}
}