comparative research 1 Exclude matching results elementary school education 1 Exclude matching results komparatívny výskum 1 Exclude matching results matematika 1 Exclude matching results mathematics 1 Exclude matching results pedagogická prax 1 Exclude matching results practice teaching 1 Exclude matching results special education 1 Exclude matching results základné vzdelávanie 1 Exclude matching results špeciálna pedagogika 1 Exclude matching results