Szymczyk, J., and Cz. Woźniak. “Continuum Modelling of Laminates With a Slowly Graded Microstructure”. Archives of Mechanics, vol. 58, no. 4-5, Sept. 2006, pp. 445-58, http://am.ippt.gov.pl/index.php/am/article/view/v58p445.