@article{MABA_2003_17_1-2_a11,
     author = {V. I. Ivanov},
     title = {Limit {Extremal} {Problems}},
     journal = {Mathematica balkanica},
     pages = {121},
     publisher = {mathdoc},
     volume = {17},
     number = {1-2},
     year = {2003},
     url = {http://geodesic.mathdoc.fr/item/MABA_2003_17_1-2_a11/}
}