Stapel, D.R.A. <br/><br/>
Experience with the mathematical model of the hydraulic net-work of Rijnland water board / D.R.A. Stapel and M. de Vrie-s. 

 - Delft, [Holanda] : Delft Hydraulics Laboratory 
 - 12 p. 
 - Delft Hydraulics Laboratory ; no. 74 .