Concerning the infinite differentiability of semigroup motions.
Spellmann, J. W.
Pacific J. Math., Tome 31 (1969) no. 3, p. 519-523 / Harvested from Project Euclid
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Publié le : 1969-05-14
Classification:  47.50 
@article{1102978506,
     author = {Spellmann, J. W.},
     title = {Concerning the infinite differentiability of semigroup motions.},
     journal = {Pacific J. Math.},
     volume = {31},
     number = {3},
     year = {1969},
     pages = { 519-523},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102978506}
}

Spellmann, J. W. Concerning the infinite differentiability of semigroup motions.. Pacific J. Math., Tome 31 (1969) no. 3, pp.  519-523. http://gdmltest.u-ga.fr/item/1102978506/