@article{MET_1988__35_3-4_176170,
     author = {E. von CollanI},
     title = {A {Unified} {Approach} to {Optimal} {Process} {Control.}},
     journal = {Metrika},
     pages = {145--159},
     publisher = {mathdoc},
     volume = {35},
     number = {3-4},
     year = {1988},
     zbl = {0709.90547},
     url = {http://geodesic.mathdoc.fr/item/MET_1988__35_3-4_176170/}
}