@MASTERSTHESIS{Be05,
  author = {Benjamin Berkels},
  title = {Gradientenflussmethoden bei inversen {P}roblemen in der {F}ernerkennung},
  school = {University of Duisburg-Essen},
  year = {2005},
  type = {Diploma thesis},
  pdf = {http://numod.ins.uni-bonn.de/research/papers/public/Be05.pdf}
}