L. E. Dickson (1926–1927). "Ternary Quadratic Forms and Congruences". Annals of Mathematics. Second Series. 28 (1/4): 333–341. doi:10.2307/1968378. JSTOR1968378. MR1502786.
L. E. Dickson (1926–1927). "Ternary Quadratic Forms and Congruences". Annals of Mathematics. Second Series. 28 (1/4): 333–341. doi:10.2307/1968378. JSTOR1968378. MR1502786.
L. E. Dickson (1926–1927). "Ternary Quadratic Forms and Congruences". Annals of Mathematics. Second Series. 28 (1/4): 333–341. doi:10.2307/1968378. JSTOR1968378. MR1502786.