Clark, C. M, E. E Cleland, Scott L Collins, J. E Fargione, Laura Gough, K. L Gross, S. C Pennings, Katharine N Suding, and J. B Grace. “Environmental And Plant Community Determinants Of Species Loss Following Nitrogen Enrichment”. Ecology Letters 10, no. 7. Ecology Letters (2007): 596-607. doi:10.1111/j.1461-0248.2007.01053.x.

Cleland, E. E, C. M Clark, Scott L Collins, J. E Fargione, Laura Gough, K. L Gross, D. G Milchunas, et al.. “Species Responses To Nitrogen Fertilization In Herbaceous Plant Communities, And Associated Species Traits”. Ecological Archives 89, no. 4. Ecological Archives (2008): 1175. doi:10.1890/07-1104.1.

Gough, Laura, K. L Gross, E. E Cleland, C. M Clark, Scott L Collins, J. E Fargione, S. C Pennings, and Katharine N Suding. “Incorporating Clonal Growth Form Clarifies The Role Of Plant Height In Response To Nitrogen Addition”. Oecologia 169, no. 4. Oecologia (2012): 1053-1062. doi:10.1007/s00442-012-2264-5.