@article{10_4064_am37_4_3,
     author = {G. Stoica},
     title = {A natural characterization
 of nonlinear cost rules},
     journal = {Applicationes Mathematicae},
     pages = {429--435},
     publisher = {mathdoc},
     volume = {37},
     number = {4},
     year = {2010},
     doi = {10.4064/am37-4-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am37-4-3/}
}