W. Dankaart

The influence of air temperature on the starting dates of the pollen season of alnus and populus

F. Ferranti, B. Romano, G. Frenguelli, 1991 .

Comparative study of airborne pollen concentrations in central Italy and the Netherlands (1982–1985)

B. Romano, G. Frenguelli, E. Bricchi, 1989 .

The appearance of pollen in the lower airways

F. Spieksma, P. Blaauw, L. Smithuis, 1991 .