Determination of selected elements by XRF and total phenolics in leaves and crude methanol extract of leaves of Arctostaphylos uva-ursi = Stanovenie vybraných prvkov metódou RRFA a celkových polyfenolov v listoch a suchom metanolovom extrakte z listov Arctostaphylos uva-ursi / Sýkorová, M. ... [et al.]. Acta Facultatis Pharmaceuticae Universitatis Comenianae. Tomus LVI S. 136-145