A Commentarium on a work is an analysis of the work, testing its hypotheses and at times taking them to their ultimate consequence, in order to analyze the substance of the work. It does not mean that the commentator agrees with the work, nor that the entire work has been analyzed under all hypotheses, since analyzing the entire work under all hypotheses is at times unfeasible.
A Commentarium on Carl Menger's Principles of Economics, based on Luiz João Baraúna's Portuguese translation. This commentarium not only follows Menger but also seeks to elucidate his premises.
A Commentarium on Hayek's The Fatal Conceit, drawing not only on that work itself but also on Aristotle's Politics.
On Mises's visit to Argentina and the distinction between the King and the ordinary salesperson.