@misc{HemantUvarpro,
    author = "Min Lu and Lanyu Zhou and Ayrton Shear and Udaya B. Kogalur and Hemant Ishwaran",
    title = {varPro: variable selection for unsupervised problems vignette},
    year = {2024},
    url = {http://www.varprotools.org/articles/unsupervise.html},
    howpublished = "\url{http://www.varprotools.org/articles/unsupervise.html}",
    note = "[accessed date]"
}