Peyman H, Esterberg E, Obermuller D, Bartsch R. Bone evaluation study-2: update on the epidemiology of osteoporosis in Germany. Dtsch Arztebl Int. 2024 Apr 9;19(1):26. doi: 10.1007/s11657-024-01380-9
Mosconi M, Nelson LM, Hooper SR. Confirmatory Factor Analysis of the NEPSY for younger and older school-age children. Psychol Rep. 2008 Jun;102(3):861-6.
Parsley (Edwards) TL. Review of the phantom respondents: opinion surveys and political representation. J Off Stat. 1994;10(3):351-5.