Upchurch, G.R. & Wolfe, J.A. (1987). Mid-Cretaceous to Early Tertiary vegetation and climate: evidence from fossil leaves and woods.

In E.M. Friis, W.G. Chaloner & P.R. Crane [eds.], The origin of angiosperms and their biological consequences, pp. 75-105. Cambridge University Press, Cambridge.
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