Cash, Webster, 1979 ( Ap.J., 228,939)
Currie, M.J., Wallace, P.T. & Warren-Smith, R.F., 1989 SGP/38 Starlink Standard Data Structures
Ponman, T.J. PROG_002 Asterix Standard Structures and Conventions
Lampton, Margon & Bowyer ( Ap.J., 208,177)
ASTERIX online help facility.