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Rao, Sri Rama P and Nagpal, S and Rao, Subba BS and Prakash, OM and Rao, Subba PV (1991) Immediate hypersensitivity to Parthenium hysterophorus. II. Clinical studies on the prevalence of parthenium rhinitis. In: Clinical and Experimental Allergy, 21 (1). 55 -62.