A=1989ApJS...70....1A Abell, Corwin, Olowin 1989, ApJS 70, 1 
B=1986A&AS...64..503B Barbon+Capaccioli 1986, A&AS 64, 503 
b=1985AJ.....90.2487B Bothun et al. 1985, AJ 90, 2487  
C=1987MNRAS.224..453C Colless & Hewett 1987 MNRAS 127, 847
c=1987A&A...179..108C Cristiani et al. 1987, AA 179, 108 
D=1988AJ.....95..985D Dressler & Shectman 1988, AJ 95, 985 
d=1989AJ.....97..315D daCosta et al. 1989, AJ 97, 315  
E=1980ApJS...42..565D Dressler 1980, ApJS 42, 565    
e=1983MNRAS.202..703D Danziger & Goss 1983, MNRAS 202, 703 
F=Cat. VII/107....... Fairall & Jones 1988, Pub.Ast.Dept. Univ.CapeTown 10
f=1986A&A...161..217F Focardi et al. 1986, AA 161, 217 
G=1986AJ.....92..250G Giovanelli et al. 1986, AJ 92, 250 
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H=1988ApJ...332L..23H Hill et al. 1988, ApJ 332, L23  
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j=1986AJ.....92.1254C Carico et al. 1986, AJ 92, 1254  
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m=1989MNRAS.236..207M Metcalfe et al. 1989, MNRAS 236, 207 
N=1987PASP...99.1261K Kirshner et al. 1987, PASP 99, 1261 
n=1989ApJS...69..809M Maia, daCosta, Latham 1989, ApJS 68, 809
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p=1989AJ.....97..633G Giovanelli & Haynes 1989, AJ 97, 633 
q=1987ApJS...63..543S Struble & Rood 1987, ApJS 63, 543 
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X=Cat. VII/107....... + 1989MNRAS.236..425U (combination of F and U)
x=1986A&A...161..217F + 1988PASP..100.1423M (combination of f and M)
Y=1980ApJS...42..565D + 1989MNRAS.236..425U (combination of E and U)
y=1989AJ.....97..315D + 1989ApJS...69..809M (combination of d and n)
z=1980ApJS...42..565D + 1989ApJS...70....1A (combination of E and A)