@article{700134,
     title = {On optimal control of systems with interface side conditions},
     booktitle = {Equadiff 6},
     series = {GDML\_Books},
     publisher = {J. E. Purkyn\v e University, Department of Mathematics},
     address = {Brno},
     year = {1986},
     pages = {[187]-190},
     mrnumber = {MR0877122},
     zbl = {0596.49015},
     url = {http://dml.mathdoc.fr/item/700134}
}

Tvrdý, Milan. On optimal control of systems with interface side conditions, dans Equadiff 6, GDML_Books,  (1986), pp. [187]-190. http://gdmltest.u-ga.fr/item/700134/