Comparing the morphology of Potamogeton perfoliatus L. along environmental gradients in Lake Balaton (Hungary)Ágnes Vári, Viktor R. Tóth and Péter CsontosAnn. Limnol. - Int. J. Lim., 46 2 (2010) 111-119DOI: https://doi.org/10.1051/limn/2010012