Biblio

H. Wihuri, “Water, sanitation and environment : exposure visit and seminar : 3 - 14 October 1994 : objective, methodology, programme and material : descriptive report”. IRC, The Hague, The Netherlands, p. ca. 500 p.: fig., maps, tab., 1994.

H. Wihuri, “Water supply and sanitation in Bulgaria, the Czech Republic, Romania and the Slovak Republic : final report”. IRC, The Hague, The Netherlands, p. iv, 60 p. + annexes (5 p.), 1994.