Pegoraro, A. and Ziller, S.R. (2003) “Apiarian value of native tree species in two natural sucessional stages in União da Vitória, State of Parana, Brazil”, Pesquisa Florestal Brasileira, (47), pp. 69–82. Available at: https://pfb.sede.embrapa.br/pfb/article/view/1609 (Accessed: 13 September 2026).