@article{FrankeScheerSpringetal.1976,
  author    = {Werner W. Franke and Ulrich Scheer and Herbert Spring and Michael F. Trendelenburg and G. Krohne},
  title     = {Morphology of transcriptional units of rDNA: evidence for transcription in apparent spacer intercepts and cleavages in the elongating nascent RNA},
  year      = {1976},
}