Chemical characteristics of poplar type propolis of different geographic origin Milena P. Popova, Vassya S. Bankova, Stefan Bogdanov, Iva Tsvetkova, Christo Naydenski, Gian Luigi Marcazzan and Anna-Gloria SabatiniApidologie, 38 3 (2007) 306DOI: https://doi.org/10.1051/apido:2007013
