Giannopoulos L, Papaparaskevas J, Refene E, Daikos G, Stavrianeas N, Tsakris A (February 2015). "MLST typing of antimicrobial-resistant Propionibacterium acnes isolates from patients with moderate to severe acne vulgaris". Anaerobe. Special Issue: Antibiotic resistance of anaerobic bacteria. 31: 50–54. doi:10.1016/j.anaerobe.2014.10.007. PMID25451716.
Giannopoulos L, Papaparaskevas J, Refene E, Daikos G, Stavrianeas N, Tsakris A (February 2015). "MLST typing of antimicrobial-resistant Propionibacterium acnes isolates from patients with moderate to severe acne vulgaris". Anaerobe. Special Issue: Antibiotic resistance of anaerobic bacteria. 31: 50–54. doi:10.1016/j.anaerobe.2014.10.007. PMID25451716.