@TechReport{posso-ddl,
  author =  {Abbott, J. and Traverso, C.},
  title = {{Specification of the POSSO External Data Representation}},
  year = 1995,
  month = sep,
  type = "Technical Report",
  howpublished = {Available electronically from {\tt
  posso.dm.unipi.it:/pub/posso/Deliverables/PossoXDR4.tex.gz}}
}