@article{JSSv033i10,
title={Inference with Linear Equality and Inequality Constraints Using R: The Package ic.infer},
volume={33},
url={https://www.jstatsoft.org/index.php/jss/article/view/v033i10},
doi={10.18637/jss.v033.i10},
abstract={In linear models and multivariate normal situations, prior information in linear inequality form may be encountered, or linear inequality hypotheses may be subjected to statistical tests. R package <b>ic.infer</b> has been developed to support inequality-constrained estimation and testing for such situations. This article gives an overview of the principles underlying inequality-constrained inference that are far less well-known than methods for unconstrained or equality-constrained models, and describes their implementation in the package.},
number={10},
journal={Journal of Statistical Software},
author={Grömping, Ulrike},
year={2010},
pages={1–31}
}