Perera P S
Angle Orthod. 1987 Jan;57(1):39-49. doi: 10.1043/0003-3219(1987)057<0039:RGAIC>2.0.CO;2.
A cephalometric and dental serial study of 29 untreated subjects over 9 years, using Björk's method of superimposition, finding statistical relationships between rotational growth of the mandible and anterior mandibular crowding.