A new paper detailing research conducted in 2008–2010 discusses the influences of habitat conditions on Himalayan balsam and Bidens frondosa, another invasive plant species
K. Kostrakiewicz-Gierałt, M. Zając. (2014) The influence of habitat conditions on the performance of two invasive, annuals — Impatiens glandulifera and Bidens frondosa. Biologia. April 2014, Volume 69, Issue 4, pp 449-462.