@article{MABA_1999_13_1-2_a13,
     author = {I. V. Iordanov and Ts. Tsachev},
     title = {The {Bang-Bang} {Principle} for a {Parabolic} {Optimal} {Control} {Problem} with {Holderain} {Cost} {Functional}},
     journal = {Mathematica balkanica},
     pages = {149},
     publisher = {mathdoc},
     volume = {13},
     number = {1-2},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/MABA_1999_13_1-2_a13/}
}