@article{NUMA_1992__61_3_133619,
     author = {Ch.G. Makridakis},
     title = {On mixed finite element methods for linear elastodynamics.},
     journal = {Numerische Mathematik},
     pages = {235--260},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {1992},
     zbl = {0734.73074},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1992__61_3_133619/}
}