Volume 19 Volume 19, Issue 4, 137–181 Volume 19, Issue 3, 95–135 Volume 19, Issue 2, 47–94 Volume 19, Issue 1, 1–46
Volume 17 Volume 17, Issue 3, 189–249 Volume 17, Issue 2, 77–188 Volume 17, Issue 1, 1-75
[117] Excerpts from a conference held at Halle in 1980; originally published in Mélanges Paul Libois, Brussels (1981), 291–296. Reused with permission.
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