Light microscopic structure of needles of Scots pine (Pinus sylvestris L.) in relation to air pollution and needle element concentrations in S.E.Finland and the Karelian Isthmus, N.W.Russia. In Trees : Structure and Function. - Berlin : Springer - Verlag. ISSN 0931-1890, 1998, roč. 12, č. 5, s. 281-288.