@article{MS2_1985__57_166960,
     author = {Elmer Bonder},
     title = {The approximation property for a pair of {Banach} spaces.},
     journal = {Mathematica Scandinavica},
     pages = {375--385},
     publisher = {mathdoc},
     volume = {57},
     year = {1985},
     zbl = {0608.46010},
     url = {http://geodesic.mathdoc.fr/item/MS2_1985__57_166960/}
}