M. A. Ballal

Assessment of creatinine and urea blood levels in healthy volunteers

G. Modawe, Shaza M. Ahamed, BadrEldin Elsanni, 2013 .

Physical condition in young adult Sudanese. A field-study using a self-paced walking test.

P H Fentem, I. Macdonald, P. Fentem, 1982, Ergonomics.