@article{10_4064_fm213_3_6,
     author = {Bartosz Frej and Paulina Frej},
     title = {An integral formula for entropy of
 doubly stochastic operators},
     journal = {Fundamenta Mathematicae},
     pages = {271--289},
     publisher = {mathdoc},
     volume = {213},
     number = {3},
     year = {2011},
     doi = {10.4064/fm213-3-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm213-3-6/}
}