@article{PORMA_1983__42_2_115538,
     author = {Istratescu, Vasile I. and Constantin, Gheorghe},
     title = {On quasi-analytic vectors for some classes of operators},
     journal = {Portugaliae mathematica},
     pages = {219--224},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {1983},
     mrnumber = {0819452},
     zbl = {0564.47001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1983__42_2_115538/}
}