@article{MABA_1989_3_3-4_a6,
     author = {Tsv. Tsachev},
     title = {An {Optimal} {Control} {Problem} for the {Heat} {Equation}},
     journal = {Mathematica balkanica},
     pages = {296},
     publisher = {mathdoc},
     volume = {3},
     number = {3-4},
     year = {1989},
     url = {http://geodesic.mathdoc.fr/item/MABA_1989_3_3-4_a6/}
}