@misc{GoellmannKernMaurer2007,
  author    = {G{\"o}llmann, Laurenz and Kern, Daniela and Maurer, Helmut},
  title     = {Optimal Control of Constrained Time-lag Systems Necessary Conditions,Numerical Treatment and Applications for Chemical Engineering, Second Mathematical Programming Society International Conference on Continuous Optimization, ICCOPT II \& MOPTA-07, August 13-16, 2007 McMaster University Hamilton, Ontario, Canada.},
  year      = {2007},
  language  = {en}
}
@misc{GoellmannKernMaurer2007,
  author    = {G{\"o}llmann, Laurenz and Kern, Daniela and Maurer, Helmut},
  title     = {Optimal control of constrained time lag systems: necessary conditions and numerical treatment, 6th International Congress on Industrial and Applied Mathematics, Zurich, Switzerland 16 - 22 July 2007.},
  year      = {2007},
  language  = {en}
}