Compositional data references.

Billheimer et al.  (1997) Natural variability of benthic species in the Delaware Bay ENVIRONMENTAL AND ECOLOGICAL STATISTICS   Volume: 4   Issue: 2   Pages: 95-115
Billheimer, Guttorp and Fagan (2001): Natural variability of benthic species in the Delaware Bay JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION   Volume: 96   Issue: 456   Pages: 1205-1214 
Billheimer (2001)r: Compositional Receptor ModelingENVIRONMETRICS   Volume: 12   Issue: 5   Pages: 451-467

J Aitchison (1986): The statistical analysis of compositional data. Chapman and Hall/