Determination of moisture content by ultrasonic method / Miloš Jerman, Ondrej Michalko, Jiří Maděra, Robert Černý .
In: Physics 2009 : proceedings of scientific works, Nitra Slovak Republic, October 2009. -- Nitra : Slovak University of Agriculture, 2009. -- ISBN 978-80-552-0264-8
http://www.slpk.sk/eldo/2010/zborniky/004-10/jerman.pdf .