 DasGupta, B. 

 DasGupta, B. (B. DasGupta, H. T. Siegelmann and E. Sontag)  On the complexity of training neural networks with continuous activation functions  1995 
 DasGupta, B. (B. DasGupta, H. T. Siegelmann and E. Sontag)  On a learnability question associated to neural networks with continuous activations  1994 
