7Fumanal B,Chauvel B,Bretagnolle F. Estimation of pollen and seed production of common ragweed in France[J].Ann Agricultural Environmental Med,2007.233-236.
8King TP. Immunochemical studies of ragweed pollen allergens[J].Allergy,1980.187-189.
9Hjelm R,Schumachen MJ,Van HM. Heterogeneity of pollen protein swith in individval Betvla Pendula tree[J].Interna Arch Allergy Immunol,1995.368-376.
10Parnia S,Brown JL,Frew A. The role of pollutants in allergic sensitization and the development of asthma[J].Allergy,2002.1111-1117.doi:10.1034/j.1398-9995.2002.02167.x.
