@article{NUMA_1973__21_132240,
     author = {Alan E. Berger},
     title = {L2 {Error} {Estimates} for {Finite} {Elements} with {Interpolated} {Boundary} {Conditions.}},
     journal = {Numerische Mathematik},
     pages = {345--349},
     year = {1973},
     volume = {21},
     zbl = {0287.65060},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1973__21_132240/}
}