@article{MartinCreuzburgSperfeldWacker2009,
  author    = {Dominik Martin-Creuzburg and Erik Sperfeld and Alexander Wacker},
  title     = {Colimitation of a freshwater herbivore by sterols and polyunsaturated fatty acids},
  doi       = {10.1098/rspb.2008.1540},
  url       = {http://rspb.royalsocietypublishing.org/content/by/year},
  year      = {2009},
}