@book{BoehmerEhrhardtOberschelp2007,
  author    = {Erwin B{\"o}hmer and Dietmar Ehrhardt and Wolfgang Oberschelp},
  title     = {Elemente der angewandten Elektrotechnik},
  edition   = {15},
  isbn      = {978-3-8348-0124-1},
  year      = {2007},
}