1. Bentarzi A. (1985). “Test de stabilite de quelques sols avec un drain nu. Expériences en perméamètres.” Mémoire de DEA CEMAGREF ENITRTS 1–73 (in French).
2. Cavelaars J. C. (1967). “Problems of water entry into plastic and other drain tubes.” Proc. Agr. Engrg. Symp. A.E.S. Paper 5/E/46 1–13.
3. Dierickx W. (1980). “Electrolytic analogue study of the effect of openings and surrounds of various permeabilities on the performance of field drainage pipes.” Communication No. 77 Nat. Inst. for Agr. Engrg. Merelbeke Belgium 1–238.