@article{NUMA_1982__40_132831,
     author = {R.E. M\"uller},
     title = {Discretization of {Multiparameter} {Eigenvalue} {Problems}},
     journal = {Numerische Mathematik},
     pages = {319--328},
     publisher = {mathdoc},
     volume = {40},
     year = {1982},
     zbl = {0487.65049},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1982__40_132831/}
}