1. Alò, R.A., Imler, L., Shapiro, H.L.: P- and z-embedded subspaces. Math. Z. 188, 13–22 (1970)
2. Ball, R.N., Walters-Wayland, J.: C- and C *-quotients in pointfree topology. Dissertationes Mathematicae (Rozprawy Mat.), vol. 412, p. 62 (2002)
3. Banaschewski, B., Brümmer, G.C.L.: Functorial uniformities on strongly zero-dimensional frames. Kyungpook Math. J. 41(2), 179–190 (2001)
4. Banaschewski, B., Gilmour, C.: Pseudocompactness and the cozero part of a frame. Comment. Math. Univ. Carolin. 37(3), 577–587 (1996)
5. Banaschewski, B., Gilmour, C.: Cozero bases of frames. J. Pure Appl. Algebra 157, 1–22 (2001)