@article{NUMA_1992__61_3_133609,
     author = {Alfredo Bem\'udez and Dolores G. Pedreira},
     title = {Mathematical analysis of a finite element method without spurious solutions for computation of dielectric waveguides.},
     journal = {Numerische Mathematik},
     pages = {39--58},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {1992},
     zbl = {0741.65095},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1992__61_3_133609/}
}