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(1) Stanley, D. South Pacific Handbook, Moon Publications Inc., California (1989)

(2) Huffman, K. Ples Blong OL Pig Long Kastom Laef Long Vanuatu, Buk 1. Vanuatu Cultural Center, Port Vila (1992)

(3) Crew, F.A.E. Abnormal Sexuality in Animals, I - Genotypical, Quart. Review of Biol. 1,3. pp 315-359 (1926)

(4) Baker, J. R. Man and Animals in the New Hebrides, London (1928)

(5) Mayer, J.J. and Brisbin, I.L. Jr. Wild Pigs of the United States The University of Georgia Press, Athens, Georgia (1991)

(6) Laing, J. A. Fertility and Infertility in Domestic Animals. Bailliere Tindall, London 1979)

(7) O'Dell, W. D. Physiology of Reproduction. The C.V. Mosby Company St. Louis (1971)

(8) Harcombe, D. Vanuatu, A Travel Survival Kit, Lonely Planet Publications, Australia (1991)

(9) Douglas, N. Vanuatu, Pacific Profiles, Alstonville, NSW, Australia (1990)

(10) Marshall, A. J. The Black Musketeers, William Hienemann Ltd. London (1937)

(11) Groves, Colin Ancestors for the Pigs, Dept. of Prehistory, Research School of Pacific Studies, Australian National University Press Technical Bulletin No. 3 (1981)

(12) Weightman, B. Agriculture in Vanuatu. British Friends of Vanuatu, Grosvenor Press Ltd., Portsmouth (1989)

(13) Clark, L.K. The Model Herd: A basis for troubleshooting reproductive failure in swine, Veterinary Medicine, Food-Animal Practice pp. 251 (1990)

(14) Baker, J. R. A New Type of Mammalian Intersexuality, British J. of Exp. Biology. 6,1. pp 56-64 (1928)

(15) Codrington, R. H. The Melanesians, Oxford, Clarendon Press. pp 57 and 80. (1891)

(16) Rivers, W.H.R. The History of Melanesian Society Cambridge University Press, Vol. 1, pp 38, 80, 98 (1914)

(17) Baker, J. R. On Sex-Integrate Pigs, British J. of Exp. Biology II. pp 247-263 (1925)

(18) Schalm, O. W. Veterinary Hematology, Lea and Febiger, Philadelphia (1975)

(19) Kaneko, J. J. Clinical Biochemistry of Domestic Animals. Academic Press, N.Y. (1980)

(20) Johnston, E. F. et al Sex Anomalies in Swine. J. of Heredity. 49, 254 (1958)

(21) Crew, F.A.E. Studies in Intersexuality, Proc. Royal Society, B 95 pp 90-109. (1923)

(22) Crew, F.A.E. Hermaphroditism in the Pig, J. of Obstetrics and Gynecology of the British Empire 31, 3 pp 3-20 (1924)

(23) Baker, J. R. On The Descended Testes of Sex-Integrate Pigs, Quarterly Journal of Micro. Science 69, 4. pp 689-701 (1925)

(24) Johnston, E. F. et al The Sex Chromatin of Swine Intersexes. J. of Heredity 49, 199-202 (1958)

(25) Jost, A. Embryonic Sexual Differentiation (Abnormalities) Williams and Wilkins, Baltimore. pp 15-45 (1958)

(26) Baker, J. R. Asymmetry in Hermaphroditic Pigs, J. of Anatomy 60, 4. pp 374-381 (1926)

(27) Gross, T. Use and Development of Non-Invasive Endocrine Procedures for Exotic Species, Journal of Theriogeneology, June (1992)

(28) Tikhonov, V.N. and Troshina, A.I. Identification of Chromosomes in Karyotypes of Subspecies of Sus Scrofa L. By Differential Staining, Doklady Akadamii Nauk, SSR (1974)

(29) Bosma, A.A. Chromosomal Polymorphism and G-Banking Patterns in Wild Boar From the Netherlands, Netherlands Genetica, (1976)

(30) Oliver, William L.R.(Editor) Pigs, Peccaries, and Hippos, Status Survey and Conservation Action Plan, I.U.C.N. Kelvyn Press, USA (1993)

(31) Hetzer, H.O. Inheritance of Coat-Color in Swine I. General Survey of Major Color Variations in Swine, J. of Heredity 36:121-128 (1945)