Bardoň, Jan: Rezistence vůči antibiotikům u kmenů Escherichia coli, Proteus mirabilis, Staphylococcus sp. a Enterococcus sp. izolovaných v chovech telat : Resistance to antibiotics in the strains of Escherichia coli, Proteus mirabilis, Staphylococcus sp., Enterococcus sp. isolated in calf breeds