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23. Campbell, J.L, Williams, C.V., Eisemann, J.H. 2004  Use of Total Dietary Fiber Across Four Lemur Species (Propithecus verreauxi coquereli, Hapalemur griseus griseus, Varecia variegata, and Eulemur fulvus):  Does Fiber Type Affect Digestive Efficiency?  American Journal of Primatology 64:323-335