1. Branco, M.J.J., Gomes, G.M.S., Gould, V.: Ehresmann monoids. J. Algebra 443, 349–382 (2015)
2. Branco, M.J.J., Gomes, G.M.S., Gould, V., Wang, Y.: Ehresmann monoids: adequacy and expansions. J. Algebra 513, 344–367 (2018)
3. Cockett, J.R.B., Guo, X., Hofstra, P.: Range categories I: general theory. Theory Appl. Categ. 24, 413–452 (2012)
4. East, J., Gray, R.D.: Ehresmann theory and partition monoids. J. Algebra. 579, 318–352 (2021)
5. FitzGerald, D.G., Kinyon, M.K.: Trace- and pseudo-products: restriction-like semigroups with a band of projections. arXiv:2102.09818