1. The European Committee on Antimicrobial Susceptibility Testing. EUCAST Disk Diffusion Test Manual. v 4.0, 2014. http://www.eucast.org/ast_of_bacteria/disk_diffusion_methodology/
2. The International Standards Organization. Clinical laboratory testing and in vitro diagnostic test systems—susceptibility testing of infectious agents and evaluation of performance of antimicrobial susceptibility test devices - part 1: reference method for testing the in vitro activity of antimicrobial agents against rapidly growing aerobic bacteria involved in infectious diseases. ISO/FDIS 20776-1:2006 http://www.iso.org/iso/catalogue_detail.htm?csnumber=41630
3. The European Committee on Antimicrobial Susceptibility Testing. Procedure for establishing zone diameter breakpoints and quality control criteria for new antimicrobial agents. EUCAST Standard Operating Procedure 9.0, November, 2014. http://www.eucast.org/documents/sops/
4. Berkhout J, Melchers MJ, van Mil AC, Nichols WW, Mouton JW (2015) In vitro activity of ceftazidime-avibactam combination in in vitro checkerboard assays. Antimicrob Agents Chemother 59(2):1138–1144
5. Clinical Laboratory and Standards Institute (2015) Performance standards for antimicrobial disk susceptibility tests, 11th ed. Approved Standard M02-A12. CLSI, Wayne, PA