Apparently Brepols holds the copyright now, and every so often Michael Tardieu puts out a new edition with updates at the end of his long (and growing) cumulative appendix of updates to the work. However, Brepols seems to print only a small number of copies of each new edition, and it soon becomes unavailable. An hour ago, the French variant of Amazon listed a single copy of the 2011 edition for somewhat more than 100 euros; but I just checked again now, and it's was within the last hour. (Note: the English/American variant of Amazon does not list all that many books published in Europe; always check all the European variants of Amazon if one wants to buy such a book.)
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Apparently Brepols holds the copyright now, and every so often Michael Tardieu puts out a new edition with updates at the end of his long (and growing) cumulative appendix of updates to the work. However, Brepols seems to print only a small number of copies of each new edition, and it soon becomes unavailable. An hour ago, the French variant of Amazon listed a single copy of the 2011 edition for somewhat more than 100 euros; but I just checked again now, and it's was within the last hour. (Note: the English/American variant of Amazon does not list all that many books published in Europe; always check all the European variants of Amazon if one wants to buy such a book.)