@article{MAN_1967__172_161581,
     author = {J\"orgen L\"ofstr\"om},
     title = {Some {Theorems} on {Interpolation} {Spaces} with {Applications} to {Approximation} in {L} p},
     journal = {Mathematische Annalen},
     pages = {176--196},
     publisher = {mathdoc},
     volume = {172},
     year = {1967},
     zbl = {0186.45701},
     url = {http://geodesic.mathdoc.fr/item/MAN_1967__172_161581/}
}