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Krogstad, O. (1996). Radiographic Cephalometry: From Basics to Videoimaging (1995). Alexander Jacobson (Ed). Publisher: Quintessence Publishing Co. Inc., London. Price:  68.00. ISBN: 0-86713-924-X. The European Journal of Orthodontics, 18(6), 671–672. doi:10.1093/ejo/18.6.671 
10.1093/ejo/18.6.671