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Negrini, A.C., Voltolini, S., Troise, C. and Arobba, D. (1992) Comparison between Urticaceae (Parietaria) Pollen Count and Hay Fever Symptoms: Assessment of a “Threshold-Value”. Aerobiologia, 8, 325-329.
http://dx.doi.org/10.1007/BF02272893
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