@article{NUMA_1979__33_132626,
     author = {R. Rannacher},
     title = {Nonconforming {Finite} {Element} {Methods} for {Eigenvalue} {Problems} in {Linear} {Plate} {Theory.}},
     journal = {Numerische Mathematik},
     pages = {23--42},
     publisher = {mathdoc},
     volume = {33},
     year = {1979},
     zbl = {0394.65035},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1979__33_132626/}
}