1. Major Problems of Theory and Practice for Overcoming the Differences in the Health Care of the Urban and Rural Population;Vlaev,1987
2. On the Problem of Bringing Specialized Out-patient and Polyclinic Treatment Closer to the Rural Population;Arnaudov,1978
3. Health-care in the settlement systems;Popivanov;Folk Advice,1981
4. Morbidity and Need for Health Care of Bulgarian Population,1977