Izvolt, L., J. Sestakova, M. Smalo, and Z. Gocalova. “Monitoring of the Track Geometry Quality Around the Portals of New Tunnel Construction Turecky Vrch - Preliminary Results”. Communications - Scientific Letters of the University of Zilina, Vol. 16, no. 4, Dec. 2014, pp. 9-20, http://journals.uniza.sk/index.php/communications/article/view/570.