1. Theoretical aspects of seepage from open channels;Bouwer;J. Hydraul. Div., Amer. Soc. Civil Eng.,1965
2. Free surface flow in porous media;Bruch;J. Irrig. Drain. Div., Amer. Soc. Civil Eng.,1967
3. Seepage from ditches-Solution by finite differences;Jeppson;J. Hydraul. Div., Amer. Soc. Civil Eng.,1968