To cite earlywarnings in publications use:

Vasilis Dakos et al. Methods for detecting early warnings of critical transitions in time series illustrated using simulated ecological dataPLoS One 7(7):e41010, 2012. See

Corresponding BibTeX entry:

    title = {R Early Warning Signals Toolbox},
    author = {Vasilis Dakos and Leo Lahti},
    journal = {The R Project for Statistical Computing},
    year = {2013},
    note =
    url = {Publication URL here},