@article{Gabriel1971,
author = {Gabriel, K.R.},
title= {The biplot graphic display of matrices with application to principal component analysis},
year = {1971},
doi = {10.1093/biomet/58.3.453},
URL = {http://www.ggebiplot.com/Gabriel1971.pdf},
journal = {Biometrika},
volume = {58},
number = {3},
pages = {453--467},
}