(1)
Penkov, D.; Dimitrova, S.; Andonova, V.; Milieva, E.; Murdjeva, M.; Stanimirova, I.; Draganov, M.; Kassarova, M. BIOLOGICAL ACTIVITY OF BULGARIAN FOLIA BETULAE DRY EXTRACT. Int J Pharm Pharm Sci 2015, 7, 289-294.