WEBB, JR, SMITH, AG, LEACOCK, RJ
et al. (1988). OPTICAL OBSERVATIONS OF 22 VIOLENTLY VARIABLE EXTRAGALACTIC SOURCES - 1968-1986
.
ASTRONOMICAL JOURNAL, 95(2), 374-397. 10.1086/114641
WEBB, JR, SMITH, AG, LEACOCK, RJ et al. (1988). OPTICAL OBSERVATIONS OF 22 VIOLENTLY VARIABLE EXTRAGALACTIC SOURCES - 1968-1986
. ASTRONOMICAL JOURNAL, 95(2), 374-397. 10.1086/114641