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Raman Spectrum of Graphite

Raman spectra are reported from single crystals of graphite and other graphite materials. Single crystals of graphite show one single line at 1575 cm−1. For the other materials ...

1970 The Journal of Chemical Physics 10317 citations

Phylogenies and the Comparative Method

Comparative studies of the relationship between two phenotypes, or between a phenotype and an environment, are frequently carried out by invalid statistical methods. Most regres...

1985 The American Naturalist 9916 citations