@article{NUMA_1978__30_132557,
     author = {E. Gekeler},
     title = {A-priori {Error} {Estimates} of {Galerkin} {Backward} {Differentiation} {Methods} in {Time-Inhomogeneous} {Parabolic} {Problem.}},
     journal = {Numerische Mathematik},
     pages = {369--384},
     publisher = {mathdoc},
     volume = {30},
     year = {1978},
     zbl = {0368.65049},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1978__30_132557/}
}