1. Carey, D.E., et al. 1971. Indian J. Med. Res. 59:1708-1711.
2. Carey, D.E., et al. 1968. Indian J. Med. Res. 56:1340-1352.
3. Salim Ali, The Book of Indian Birds. 7th Ed. Bombay Natural History Society. Bombay, India. c. 1964.
4. Zeller, H. et al. 1989. III. Arch. Virol. Submitted.
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