@article{Wheeler2005,
author = {Wheeler, D. and Tiefelsdorf, M.},
title= {Multicollinearity and correlation among local regression coefficients in geographically weighted regression},
year = {2005},
doi = {10.1007/s10109-005-0155-6},
journal = {Journal of Geographical Systems},
volume = {7},
number = {2},
pages = {161--187},
}