@PhdThesis{lundmark-thesis,
  author = 	 {Lundmark, Hans},
  title = 	 {{N}ewton systems of cofactor type in {E}uclidean and {R}iemannian spaces},
  school = 	 {Matematiska institutionen, Link{\"o}pings universitet},
  year = 	 {2001},
  note = 	 {Link{\"o}ping Studies in Science and Technology. Dissertations. No.~719}
}