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
[20] Originally published in C. R. Acad. Sci. Paris 239 (1954), 526–527. Reused with permission.
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