Cyclotomy of order 15 over G F ( p 2 ) , p = 4 , 11 (mod 15). Friesen, Christian; Muskat, Joseph B.; Spearman, Blair K.; Williams, Kenneth S. — 1986 International Journal of Mathematics and Mathematical Sciences
Predictive criteria for the representation of primes by binary quadratic forms Joseph B. Muskat; Blair K. Spearman; Kenneth S. Williams — 1995 Acta Arithmetica