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An interview was published in the Dutch journal Tijdschrift voor Gregoriaans (issue TvG-2014-3/4, see Archive) with conductor Eugeen Liven d’Abelardo on the Psalterium Project. Here is the interview.
There is an extensive review of the 12CD's by Fr. Jerome F Weber (Fanfare Magazine, 42:2,2018) on the website of the Psalterium Foundation: www.psalterium.nl.