@article{HodvinaCezanne,
  author    = {Sylvain Hodvina and Rainer Cezanne},
  title     = {Der Acker-Schwarzk{\"u}mmel (Nigella arvensis) in Hessen},
  journal   = {Botanik und Naturschutz in Hessen},
  volume    = {20},
  pages     = {61 -- 88},
}