1. Björk, A.: Prediction of mandibular growth rotation. Amer. J. Orthodont. 55 (1969), 585.
2. Broadbent, B. H.: A new X-ray-technique and its application to orthodontia. Angle Orthodont. 1 (1931), 45.
3. Chaddock, E. R.: Sedar-Udzbenik Statistike. Skolska Knjiga, Zagreb 1961, S. 318.
4. Jarabak, J. R.: Technique and treatment with the light wire appliance. Vol. 1. C. V. Mosby Co., Saint Louis 1983, p. 128.
5. Lienert, G. A.: Testaufbau und Testanalyse. Beltz. Weinheim-Berlin 1967, S. 478.