@Phdthesis{PhdLiu2014,
  author = {Liu, Chun},
  title  = {Multi‐Robot Task Allocation for Inspection Problems with Cooperative
	Tasks Using Hybrid Genetic Algorithms},

  year   = {2014},
  number = {},
  url    = {https://hds.hebis.de/ubks/Record/HEB348752881},

  const  = {\ text}
}
@Phdthesis{Phd:Bonow-2014,
  author = {Bonow, Gero},
  title  = {Gasleckortungsmethode für autonome mobile Inspektionsroboter mit
	optischer Gasfernmesstechnik in industrieller Umgebung},

  year   = {2015},
  number = {},
  url    = {https://hds.hebis.de/ubks/Record/HEB35850435X},

  const  = {\ text}
}