Ternary Cyclotomic Polynomials

Cyclotomic polynomials of the form Phi_{pqr}(x) with p,q,r distinct odd primes are called ternary
cyclotomic polynomials. They are the easiest class of polynomials for which the behaviour of the
coefficients is not very well understood. I will present my methods and ideas to evaluate coefficients
and differences between consecutive coefficients of such polynomials.