Nyquist (Nth) digital filters

I am working in something were I should use a upsampling filter. I have decided to use a Nyquist filter(Lth filter). I know that there are two constraints. The first The frequency vector values must mirror each other in pairs around $\pi/2$. The second is the amplitude vector values must mirror each other in pairs around a magnitude of 0.50 What I am looking for are references to actually design these types of filters. I cant find any references that show how to implement them.

So dose anyone have a decent reference on hoe to design these filters? Does anyone have a reference on implementing these in Verilog?