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Hypericum richeri subsp. burseri sensu JORDANOV, D. (ed.) - Flora na Narodna Republika Balgarija. Izdatelstvo na Balgarskata akademija na naukite, Sofija, 1963-... 1: [1]-507. 1963, 2: [1]-423. 1964; 3: [1]-637. 1966; 4: [1]-748. 1970; 5: [1]-442. 1973; 6: [1]-590. 1976; 7: [1]-529. 1979; 8: [1]-518. 1982-...