@article{10_4064_sm170_2_4,
     author = {N. Krugljak and Y. Sagher and P. Shvartsman},
     title = {Weak-type operators and the strong fundamental
 lemma of real interpolation theory},
     journal = {Studia Mathematica},
     pages = {173--201},
     year = {2005},
     volume = {170},
     number = {2},
     doi = {10.4064/sm170-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm170-2-4/}
}