@article{IM2_2010_74_3_a7,
     author = {A. I. Stepanets and A. L. Shidlich},
     title = {Extremal problems for integrals of non-negative functions},
     journal = {Izvestiya. Mathematics },
     pages = {607--660},
     publisher = {mathdoc},
     volume = {74},
     number = {3},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2010_74_3_a7/}
}