@Manual{ref_1,
  author = 	 {Fossen, T.I.},
  title = 	 {Marine Control Systems},
  school =	{Norwegian University of Science and Technology},
  publisher =	{Marine Cybernetics},
  year =	{2002}
}

@PhdThesis{ref_2,
  author = 	 {Mišković, N.},
  title = 	 {Use of self-oscillations in guidance and control of marine vessels},
  school = 	 {University of Zagreb 
Faculty of electrical engineering and computing},
  year = 	 {2010},
}

@Manual{ref_3,
  author = 	 {Vukić, Z. and Kuljača, LJ.},
  title = 	 {Nonlinear Control Systems},
  organization = 	 {University of Zagreb, Faculty of electrical engineering and computing},
  year = 	 {2010},
  }
  