@article{Egozcue2005,
author = {Egozcue, J.J. and Pawlowsky-Glahn, V.},
title= {Groups of parts and their balances in compositional data analysis},
year = {2005},
doi = {10.1007/s11004-005-7381-9},
volume = {37},
number = {7},
pages = {795‒828},
}