@article{04115364,
title = {The linear optimal control problem with variable endpoints.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {46(60)},
year = {1989},
pages = {133-142},
zbl = {0681.49002},
language = {en},
url = {http://dml.mathdoc.fr/item/04115364}
}
Janković, Vladimir. The linear optimal control problem with variable endpoints.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 46(60) (1989) pp. 133-142. http://gdmltest.u-ga.fr/item/04115364/