@article{SJVM_1999_2_4_a0,
     author = {A. B. Andreev and T. D. Todorov},
     title = {Lumped mass approximation for an isoparametric finite element eigenvalue problem},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
     pages = {295--308},
     publisher = {mathdoc},
     volume = {2},
     number = {4},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SJVM_1999_2_4_a0/}
}