@article{NUMA_1980__36_132702,
     author = {K. Ishihara},
     title = {A {Finite} {Element} {Lumped} {Mass} {Scheme} for {Solving} {Eigenvalue} {Problems} of {Circular} {Arches.}},
     journal = {Numerische Mathematik},
     pages = {267--290},
     publisher = {mathdoc},
     volume = {36},
     year = {1980},
     zbl = {0438.73065},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1980__36_132702/}
}