@article{PORMA_1993__50_3_115688,
     author = {Bergamasco, Adalberto P. and Petronilho, Gerson},
     title = {A construction of parametrices of elliptic boundary value problems},
     journal = {Portugaliae mathematica},
     pages = {263--276},
     publisher = {mathdoc},
     volume = {50},
     number = {3},
     year = {1993},
     mrnumber = {1244506},
     zbl = {0826.35032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1993__50_3_115688/}
}