KUBÍK, Ľubomír - ZEMAN, Stanislav. Tensile properties of plastic foils. In PRAE 2011 : proceedings of scientific works,. Nitra : Slovak University of Agriculture, 2011. ISBN 978-80-552-0662-2. , s. 90-94. Available on Internet:<http://www.slpk.sk/eldo/2012/zborniky/004-12/Kubik.pdf>