Janssen's Geschichte des deutschen Volkes, i. 315; Gramich's Wurzburg; and, in fact, any collection of ordinances. Falke, Geschichtliche Statistik, i. 373-393, and ii. 66; quoted in Janssen's Geschichte, i. 339; J.D. Blavignac, in Comptes et depenses de la construction du clocher de Saint-Nicolas a Fribourg en Suisse, comes to a similar conclusion.