Fick AE & Weber E (1877) Anatomisch-mechanische Studie ueber die Schultermuskeln I. Verhandl. Würz. Phys. Med. Ges., 11:123-153

Description (in German) of the method to estimate moment arms of shoulder muscles in 3-D. The analysis is worked out for two different arm positions. This paper is one of the first papers where the relationship between angle changes and length changes was used.
Paper available here

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