{{Cite journal| volume = 13| pages = 419–429| last1 = Brun| first1 = Jean-Pierre| last2 = Ballard| first2 = Jean-François| last3 = Le Corre| first3 = Claude| title = Identification of Ordovician block-tilting in the Hercynian fold-belt of Central Brittany (France): field evidence and computer models| journal = J. Struct. Geol.| date = 1991}}