The course of the backward attacks in judo, after the first change of the rules, based on The World Championship from 2009 and 2011 in over 100 kg category : a pilot study

Journal of Education, Health and Sport, Tom 6, Numer 6 (2016) s. 223-234
Małgorzata Pujszo, Ryszard Pujszo, Robert Stępniak, Marek Adam