1. Davis R.R., Denny N.T., Newton L.M., (1963) —A comparison between the summer and autumn air spores at London and Liverpool. Acta Allergol.,18, 138–147.
2. Durham O.C., Black J.H., Glaser J., Walger M., (1946) —Preliminary report of the pollen survey committee of the American Academy of Allergy of proposed standerization of pollen counting technique. J. Allergy,17, 178–180.
3. Grandini, C., Fasani F., Gorini M., (1983) —Airborne pollen in urban atmosphere of Pavia (Italy). Folia. Allergol. Immunol. Clin.,32 (3), 211–217.
4. Hyde H.A. (1959) —Volumetric counts of pollen grains at Cardiff, 1954–1957. J. Allergy,30, 219–234.
5. Lomagno R.C., Polini V., Siniscalco C., (1985–86) —Airborne pollen flora in Torino (Northern Italy). Allionia27, 61–64.