@article{10_4153_CJM_1976_076_0,
     author = {Duff, G. F. D.},
     title = {A {General} {Integral} {Inequality} for the {Derivative} of an {Equimeasurable} {Rearrangement}},
     journal = {Canadian journal of mathematics},
     pages = {793--804},
     year = {1976},
     volume = {28},
     number = {4},
     doi = {10.4153/CJM-1976-076-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-076-0/}
}