Acta academiae Aboensis. Ser.B, Mathematica et physica / Abo akad. Vol. 65,N 4 : Quantitative elemental analysis of dry-ashed bark and wood samples of birch, spruce and pine from south-western Finland using PIXE / K-E.Saarela, L.Harju, J-O.Lill [et al.], 2005. - 27 p. - Текст : непосредственный.