Dresden, Greg; Dymàček, Wayne M. Finding Factors of Factor Rings over the Gaussian Integers. The American Mathematical Monthly. 2005-08-01, 112 (7): 602. doi:10.2307/30037545.
The negaternary system is discussed briefly in Marko Petkovsek. Ambiguous Numbers are Dense. The American Mathematical Monthly. 1990-05, 97 (5): 408 [2020-06-19]. doi:10.2307/2324393. (原始内容存档于2020-06-10).
The negaternary system is discussed briefly in Marko Petkovsek. Ambiguous Numbers are Dense. The American Mathematical Monthly. 1990-05, 97 (5): 408 [2020-06-19]. doi:10.2307/2324393. (原始内容存档于2020-06-10).
The negaternary system is discussed briefly in Marko Petkovsek. Ambiguous Numbers are Dense. The American Mathematical Monthly. 1990-05, 97 (5): 408 [2020-06-19]. doi:10.2307/2324393. (原始内容存档于2020-06-10).