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Bennett, D. L.; Gillis, D. K.; Portney, L. G.; Romanow, M.; Sanchez, A. S. (1989). "Comparison of integrated electromyographic activity and lumbar curvature during standing and during sitting in three chairs". Physical Therapy. 69 (11): 902–913. doi:10.1093/ptj/69.11.902. PMID2813518.
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Lander, C.; Korbon, G. A.; Degood, D. E.; Rowlingson, J. C. (1987). "The Balans chair and its semi-kneeling position: an ergonomic comparison with the conventional sitting position". Spine. 12 (3): 269–272. doi:10.1097/00007632-198704000-00014. PMID2954222. S2CID26945564.