@article{10_4064_am36_3_4,
     author = {Urszula Ledzewicz and Vignon Oussa and Heinz Sch\"attler},
     title = {Optimal solutions for a model
 of tumor anti-angiogenesis with a penalty
 on the cost of treatment},
     journal = {Applicationes Mathematicae},
     pages = {295--312},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {2009},
     doi = {10.4064/am36-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am36-3-4/}
}