HLAVÁČ, Peter. Dependencies of some food materials density on chosen parameters. In PRAE 2011 : proceedings of scientific works,. Nitra : Slovak University of Agriculture, 2011. ISBN 978-80-552-0662-2. , s. 48-51. Dostupné na internete:<http://www.slpk.sk/eldo/2012/zborniky/004-12/Hlavac1.pdf>