Vigne, L.; Martin, E.B. 1997. An historical perspective of the Yemeni horn trade. Pachyderm 23: 29-40, figs. 1-8, map 1.
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Martin, E.B. 1996. The importance of park budgets, intelligence networks and competent management for succesful conservation of the greater one-horned rhinoceros. Pachyderm 22: 10-17, figs. 1-4, tables 1-2.
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Martin, E.B. 1996. Major trade routes for rhino horn within and out of Africa from 1984-1994. Kenya Past and Present 28: 15-18, figs. 1-4.
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Martin, E.B. 1996. Smuggling routes for West Bengal’s rhino horn and recent successes in curbing poaching. Pachyderm 21: 28-34, figs. 1-6.