Chilova-Atanassova, B., Hristov, B., Hristeva, S., Andreev, A., Dzheneva, M., Gyuleva, G., Petkova, D., Georgieva, E., Balian, A., Konareva, M., Katsarov, K. Blindness in different types of eye diseases. A study based on the records of the departament of eye diseases in the Medical university, Plovdiv for the period 1982-1991,
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