Observations of the Lyman limit in 19 QSOs
Journal article published in 1981 by
M.~G Smith,
R.~F Carswell,
J.~A.~J Whelan,
B.~J Wilkes 
,
A. Boksenberg,
R.~G Clowes,
A. Savage,
R.~D Cannon,
J. Wall
,
A. Boksenberg,
R.~G Clowes,
A. Savage,
R.~D Cannon,
J. Wall
