Degrees of freedom (mechanics) (English Wikipedia)

Pennestrı̀, E.; Cavacece, M.; Vita, L. (2005). "On the Computation of Degrees-of-Freedom: A Didactic Perspective". Volume 6: 5th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A, B, and C. 2005 ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. California, US. pp. 1733–1741. doi:10.1115/DETC2005-84109. ISBN 0-7918-4743-8.

mit.edu (Global: 415^th place; English: 327^th place)

Hale, Layton C. (1999). Principles and techniques for designing precision machines (PDF) (PhD). Massachusetts Institute of Technology.

Pennestrı̀, E.; Cavacece, M.; Vita, L. (2005). "On the Computation of Degrees-of-Freedom: A Didactic Perspective". Volume 6: 5th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A, B, and C. 2005 ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. California, US. pp. 1733–1741. doi:10.1115/DETC2005-84109. ISBN 0-7918-4743-8.