@article{SpringKrohneFrankeetal.1976,
  author    = {Herbert Spring and Georg Krohne and Werner W. Franke and Ulrich Scheer and Michael F. Trendelenburg},
  title     = {Homogeneity and heterogeneity of sizes of transcriptional units and spacer regions in nucleolar genes of Acetabularia},
  year      = {1976},
}