Encyclopedias and dictionaries of philosophy do not usually contain any item under the heading 'critical problem.' Here, below, however, is a review of a book on the Critical Problem as handled by various professors in the Roman ecclesiastical universities in the 1980s.
Shardella, A. Review of The Critical Problem of Knowledge, ed. Giovanni Blandino and Aniceto Molinaro. Rome: Herder / Pontifical Lateran University, 1989. La Civiltà Cattolica Anno 142, III, quaderni 3385-3390 (1991) 325-326.