Balawejder, A., M. Chalfen, T. Molski, and A. Surowiecki. “The Stability of Hydro Technical Embankments under Various Seepage Conditions”. Communications - Scientific Letters of the University of Zilina, Vol. 9, no. 1, Mar. 2007, pp. 67-70, http://journals.uniza.sk/index.php/communications/article/view/1117.