@article{Willms1993,
  author    = {Willms, Herbert},
  title     = {Regelung eines H2/O2-Dampferzeugers mit Hilfe eines modifizierten Zirkondioxid-Sensors},
  series = {Chemie Ingenieur Technik},
  volume    = {65},
  journal   = {Chemie Ingenieur Technik},
  number    = {8},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  isbn      = {0009-286X},
  pages     = {954 -- 956},
  year      = {1993},
  language  = {de}
}
@article{WillmsBeer1992,
  author    = {Willms, Herbert and Beer, Stefan},
  title     = {Regelung eines H(IND 2)/O(IND 2)-Dampferzeugers},
  isbn      = {0939-2963},
  year      = {1992},
  language  = {de}
}
@article{WillmsBeerFroehlkeetal.1993,
  author    = {Willms, Herbert and Beer, Stefan and Fr{\"o}hlke, K. and Haidn, O.J. and [u.a.],},
  title     = {Regelung eines Wasserstoff-/Sauerstoff-Dampferzeugers mit Hilfe eines modifizierten Zirkondioxid-Sensors},
  year      = {1993},
  language  = {de}
}