@article{PORMA_1977__36_2_115307,
     author = {Young, Eutiquio C.},
     title = {Uniqueness of solutions of the {Neumann} problem for singular ultrahyperbolic equations},
     journal = {Portugaliae mathematica},
     pages = {97--102},
     publisher = {mathdoc},
     volume = {36},
     number = {2},
     year = {1977},
     mrnumber = {0577415},
     zbl = {0434.35063},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1977__36_2_115307/}
}