@article{WoelflTittelZippeletal.2000,
  author    = {S. W{\"o}lfl and J{\"o}rg Tittel and Barbara Zippel and R. Kringel},
  title     = {Occurrence of an algal mass development in an acidic (pH 2.5), iron and aluminium-rich coal mining pond},
  year      = {2000},
}