@article{NUMA_1972__19_132137,
     author = {G. Fix and N. Nassif},
     title = {On {Finite} {Element} {Approximations} to {Time-Dependent} {Problems.}},
     journal = {Numerische Mathematik},
     pages = {127--135},
     publisher = {mathdoc},
     volume = {19},
     year = {1972},
     zbl = {0244.65063},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1972__19_132137/}
}