Article PubMed
The American naturalist  (2004)

Similarity of mammalian body size across the taxonomic hierarchy and across space and time.

Smith, Felisa A; Brown, James H; Haskell, John P; Lyons, S Kathleen; Alroy, John; Charnov, Eric L; Dayan, Tamar; Enquist, Brian J; Ernest, S K Morgan; Hadly, Elizabeth A; Jones, Kate E; Kaufman, Dawn M; Marquet, Pablo A; Maurer, Brian A; Niklas, Karl J; Porter, Warren P; Tiffney, Bruce; Willig, Michael R