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Umadevi K; R. Madhavi (2000). "Observations on the morphology and life-cycle of Procerovum varium (Onji & Nishio, 1916) (Trematoda: Heterophyidae)". Systematic Parasitology. 46 (3): 215–225. doi:10.1023/A:1006398205390. PMID10845654. S2CID4497926.
Muralidharan, S.; Jayakumar, R.; Vishnu, G (2004). "Heavy metals in feathers of six species of birds in the district Nilgiris, India". Bulletin of Environmental Contamination and Toxicology. 73 (2): 285–291. doi:10.1007/s00128-004-0425-x. PMID15386041. S2CID26914063.