PRACE DOKTORSKIE - SZWECJA 546,519 SCHULDT KRISTINA On neck muscle activity and load reduction in sitting postures : an electromyographic and biomechanical study with applications in ergonomics and rehabilitation : [thesis] / by Kristina Schilldt ; Department of Physical Medicine. - Stockholm : [distr.] The Almqvist and Wiksell Periodical Co., 1988. - 49 s. : il. wykr. ; 25 cm (Scandinavian Journal of Rehabilitation Medicine ISSN 0346-8720 ; suppl. No.19)