GMsf

Marsh, Gordon. n.d. (slip file).

@None{gmsf,
  author = {Marsh, Gordon},
  title  = {(slip file)}
}
@None{gmsf,
  author = {Marsh, Gordon},
  title  = {(slip file)}
}
@None{gmsf,
  author = {Marsh, Gordon},
  title  = {(slip file)}
}