 
                
                                                    
                        Plug, E., van Praag, B.M.S. and Hartog, J. (1999). If we knew ability, how would we tax individuals? Journal of Public Economics, 72(2):183--211.                    
                            
         
                 
                 
                 
                 
                 
                 
                Paul den Hek (1999). On endogenous growth under uncertainty International Economic Review.