Visible and microscopic needle alterations of mature Aleppo pine (Pinus halepensis) trees growing on an ozone gradient in eastern Spain

Kivimaenpaa, M., Sutinen, S., Calatayud, V., Sanz, M.J. 2010. Visible and microscopic needle alterations of mature Aleppo pine (Pinus halepensis) trees growing on an ozone gradient in eastern Spain. TREE PHYSIOLOGY, 30:541-554.