session "SeLFiE" (psl) in "../SeLFiE" = HOL +
  options [timeout = 600]
  theories [document = false]
    "SeLFiE"
  document_files
    "root.tex"
    "root.bib"

session "PSL" (psl) in "../PSL" = SeLFiE +
  options [timeout = 600]
  theories [document = false]
    "PSL"
  document_files
    "root.tex"
    "root.bib"

session "TBC" (psl) in "." = PSL +
  options [timeout = 600]
  theories [document = false]
    "TBC"
  document_files
    "root.tex"
    "root.bib"