@incollection{MEM_2012_41_1_a2,
     author = {Tsachev, Tsvetomir},
     title = {Optimal {Control} of {Heterogeneous} {Systems}},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {70--82},
     year = {2012},
     volume = {41},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MEM_2012_41_1_a2/}
}