Lin, W., Shi, P., Feng, R. and Li, H. (2014): Variable selection in regression with compositional covariates. Biometrika, 101(4): 785-797.
https://academic.oup.com/biomet/article-abstract/101/4/785/1775476?redirectedFrom=fulltext
ConstrLasso.R: functions for estimation of linearly constrained lasso regression.
testcode.R: showcase of the usage of our method using a simulated toy example.