Journal Article
                        
                        Lim, Tek-Ang, Lili  Marinova, Mira  Kojouharova, Svetla  Tsolova, and Jan C Semenza.  
"Measles outbreak in Bulgaria: poor maternal educational attainment as a risk factor for medical complications." The European Journal of Public Health 23, no. 4 (2013): 663-669.