- W.J. Gilbert and R. James Green,
Negative Based Number Systems, Math. Mag. 52 (1979), 240-244.

[Math Reviews 82e:10001; Zentralblatt Math:418.10008] - W.J. Gilbert, Radix Representations of Quadratic Fields, J. Math. Analysis and Applications 83 (1981), 264-274.

[Math Reviews 83m:12005; Zentralblatt Math:472.10011]

[*also see*Cubic CNS polynomials, notes on a conjecture of W.J. Gilbert by Shigeki Akiyama, Horst Brunotte and Attila Petho, J. Math. Anal. Appl. 281 (2003), 402-415.] - W.J. Gilbert, Geometry of radix representations, in the Geometric Vein: The Coxeter Festschrift, edited by C. Davis et al., Springer, New York, 1981, 129-139.

[Math Reviews 83j:12001; Zentralblatt Math:508.12002] - W.J. Gilbert, Fractal Geometry derived from Complex Bases, Math. Intelligencer 4 (1982), 78-86.

[Math Reviews 83m:10092; Zentralblatt Math:493.10010] - W.J. Gilbert, Complex Numbers with three radix expansions, Can. J. Math. 34 (1982), 1335-1348.

[Math Reviews 85c:11013; Zentralblatt Math:494.10005] - W.J. Gilbert,
Arithmetic in Complex Bases, Math. Magazine 57 (1984), 77-81.

[Zentralblatt Math:539.10011] - W.J. Gilbert, A cube-filling Hilbert curve, Math. Intelligencer 6(3) (1984), p.78.
- W.J. Gilbert, The Fractal Dimension of Sets derived from Complex Bases, Can. Math. Bull. 29 (1986), 495-500.

[Math Reviews 88b:28014; Zentralblatt Math:564.10007] - W.J. Gilbert,
Complex Bases and Fractal Similarity, Ann. Sc. Math. Quebec 11 (1987), 65-77.

[Math Reviews 89a:11017; Zentralblatt Math:633.10008] - W.J. Gilbert, The Division Algorithm in Complex Bases, Can. Math. Bull. 39 (1996), 47-54.

[Math Reviews 97a:11019; Zentralblatt Math:851.11004] - J.-P. Allouche, E. Cateland, W.J. Gilbert, H.-O. Peitgen, J.O. Shallit,
and G. Skordev, Automatic Maps in Exotic Numeration Systems,
Theory of Computing Systems
30 (1997), 285-331.

[Math Reviews 98a:68114; Zentralblatt Math:870.68105] - W.J. Gilbert, Complex Based Number Systems (Manuscript)

[*formerly called*Gaussian Integers as Bases for Exotic Number Systems (1989)] - J.C. Beatty, Raster Graphics and Color, The Amer. Statistician, 37 (1983), 60-75 contains a coloured photograph of the complex base 1-i, by W.J. Gilbert on page 68.

- W.J. Gilbert: Julia Program written in Objective C for the NeXT computer only and distributed on CD ROMs called monoLib (monolithic Library) produced by monoChrome Systems, Edison, N.J. (1992) [The program with source was on the PEAK and PEANUTS NeXT Archives, but these are gone now.]
- W.J. Gilbert: Rational Mandelbrot Set Program (RatMandel) written in Objective C for the NeXT computer only and distributed on the Big Green CD ROM 4.0, Skylee Press, San Francisco (1994) [The program with source was on the PEAK and PEANUTS NeXT Archives, but these are gone now.]