Great paper Andrew!!

Out of curiosity , how do you come up w/ the choice of modulo polynomials? Trial & error to figure out polynomial which'd give the minimal muls?
For cyclic convolutions, it's pretty simple(cyclotomic poly.) but I've always been intrigued by how one comes up w/ ones for acyclic conv. ( I did read Nussbaumer/HK Garg/Tolimieri/Blahut etc, but haven't been able to figure out a standard method yet).

Thanks!