@article{10_4064_sm_70_3_203_220,
     author = {Ehrhard Behrends},
     title = {Operators which respect norm intervals},
     journal = {Studia Mathematica},
     pages = {203--220},
     publisher = {mathdoc},
     volume = {70},
     number = {3},
     year = {1981},
     doi = {10.4064/sm-70-3-203-220},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-70-3-203-220/}
}