@article{CLTM_1979_1979_1_a0,
     author = {Tita, Nicolae},
     title = {Operadores {l(\ensuremath{\Phi},\ensuremath{\varphi})} y espacios {(\ensuremath{\Phi},\ensuremath{\varphi}).}},
     journal = {Collectanea mathematica},
     pages = {3-9},
     year = {1979},
     volume = {30},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1979_1979_1_a0/}
}