G. Tsakiris y Santos, M. A.,
«Advances in water resources technology and management : proceedings of the Second European Conference on Advances in Water Resources Technology and Management, Lisbon, Portugal, 14-18 June 1994». A.A. Balkema, Rotterdam, The Netherlands, p. xiii, 498 p.: fig., tab., 1994.
W. Hogrewe,
«Prefeasibility study : Sevlievo, Bulgaria», vol. no. 451. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. vii, 22 p.: 2 fig., 9 tab., 1994.
J. E. Gould y Naidu, K. G.,
«Rainwater catchment : possibilities in urban and peri-urban Botswana», in
Participation in rainwater collection for low income communities and sustainable development : proceedings of the sixth International Conference on Rainwater Catchment Systems, 1-6 August, 1993, 1994, pp. P. 117-128 : 3 fig., 3 tab.