1. Knothe, Klaus: August Wöhler (1818-1914) Dauerfestigkeit und Langzeitverhalten — Western und heute. — ZEVrail Glasers Annalen, Jg.127, 2003, Nr.8, August, S. 384 — 386.
2. EN13103 — Railway application — Wheelsets and bogies - Non-powered axles — Design method.
3. EN13104:March 2009 — Railway application — Wheelsets and bogies - Powered axles — Design method.
4. EN13261: March 2009 — Railway application — Wheelsets and bogies - Axles - Product requirements.
5. EN13260: March 2009 — Railway application — Wheelsets and bogies - Wheelsets - Product requirements.