1. Dambos in Nordrhodesia;Ackermann;Wiss. Veroff. Leipzig,1936
2. Derivation of a general flood-wave hydrograph from a continuous watershed water balance;Ayers,1967
3. A year round water balance model of a general watershed;Ayers;Acta Tech., Prague,1969
4. Water balance of the Zambezi basin;Balek;Nat. Counc. Sci. Res., Tech. Rep. 15, Water Resour.,1971