@article{MS2_1978__42_166593,
     author = {Jan Gustavsson},
     title = {A function parameter in connection with interpolation of {Banach} spaces.},
     journal = {Mathematica Scandinavica},
     pages = {289--305},
     publisher = {mathdoc},
     volume = {42},
     year = {1978},
     zbl = {0389.46024},
     url = {http://geodesic.mathdoc.fr/item/MS2_1978__42_166593/}
}