Uhlin, D., S. Lutteman, J. A. M. Jennings, and R. L. Brautaset. “Refractive Trends in Swedish Military Recruits”. Scandinavian Journal of Optometry and Visual Science, vol. 2, no. 1, Jan. 2011, pp. 1-5, doi:10.5384/sjovs.vol2i1p1-5.