Grechko, L. G., V. V. Gozhenko, і K. W. Whites. 2001. «Anisotropy of Electrical Properties of a Layer of Spherical Particles Located Near a Substrate». Поверхня, вип. 4-6 (Червень), 179-86. http://surfacezbir.com.ua/index.php/surface/article/view/57.