@article{10_4064_sm227_1_2,
     author = {Karol Le\'snik},
     title = {Monotone substochastic operators and
 a new {Calder\'on} couple},
     journal = {Studia Mathematica},
     pages = {21--39},
     year = {2015},
     volume = {227},
     number = {1},
     doi = {10.4064/sm227-1-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm227-1-2/}
}