References
- Ekström , U. , Jacobson , R. , Mattsen , M. and Porsne , T. 1988 . Ölands och Gotlands växtvärld. En ekologisk och kulturhistorisk flora , Stockholm : Natur Kultur .
- Hage‐Hamsten , M. , van, Johansson , S. G. O. and Zetterström , O. 1987 . Predominance of mite allergy over allergy to pollens and animal danders in a farming population . Clin Allergy , 17 : 417 – 423 .
- Hirst , J. M. 1952 . An automatic volumetric spore trap . Ann Appl. Biol. , 36 : 257 – 265 .
- Hjelmroos , M. 1992 . Evidence of long‐distance transport of Betula pollen . Grana , 30 : 215 – 228 .
- Hjelmroos , M. and van Hage‐Hamsten , M. 1993 . Birch pollen dispersal on the Baltic island, Gotland . Grana Suppl. , 2 : 75 – 79 .
- Jögi , R. , Janson , C. , Björnsson , E. , Boman , G. and Björksten , B. 1996 . The prevalence of asthmatic respiratory symptoms among adults in Estonian and Swedish university cities . Allergy , 51 : 331 – 336 .
- Käpylä , M. and Penttinen , A. 1981 . An evaluation of the microscopial counting methods of the tape in Hirst‐Burkard pollen and spore trap . Grana , 20 : 131 – 141 .
- Nilsson , S. and Persson , S. 1981 . Tree pollen spectra in the Stockholm region (Sweden), 1973–1980 . Grana , 20 : 179 – 182 .
- Riikjärv , M. A. , Julge , K. , Vasar , M. , Bràbäck , L. , Knutsson , A. and Björksten , B. 1995 . The prevalence of atopic sensitisation and respiratory symptoms among Estonian schoolchildren . Clin. Exp. Allergy , 25 : 1198 – 1204 .
- Wallin , J.‐E. , Segerström , U. , Rosenhall , L. , Bergman , E. and Hjelmroos , M. 1991 . Allergic symptoms caused by long‐distance transported birch pollen . Grana , 30 : 265 – 268 .