@article{NUMA_1980__35_186305,
     author = {A.K. Aziz and M. Schneider and A. Werschulz},
     title = {A {Finite} {Element} {Method} for the {Tricomi} {Problem.}},
     journal = {Numerische Mathematik},
     pages = {13--20},
     publisher = {mathdoc},
     volume = {35},
     year = {1980},
     zbl = {0439.65096},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1980__35_186305/}
}