1 = Blashki.et.al.
2 = Byerly.et.al.
3 = Claghorn.et.al.
4 = Davidson&Turnbull
5 = Elkin.et.al.
6 = Goldberg.et.al.
7 = Joffe.et.al.
8 = Kahn.et.al.
9 = Kiev&Okerson
10 = Lydiard
11 = Ravaris.et.al.
12 = Rickels.et.al.
13 = Rickels&Case
14 = Robinson.et.al.
15 = Schweizer.et.al.
16 = Stark&Hardison
17 = van.der.Velde
18 = White.et.al.
19 = Zung