KITSUNEZUKA, Y., MATSUDA, R. and SUGATANI, T. 1999. NOTE ON 1-DIMENSIONAL INTEGRALLY CLOSED MORI SEMIGROUPS. Tamkang Journal of Mathematics. 30, 4 (Dec. 1999), 295–297. DOI:https://doi.org/10.5556/j.tkjm.30.1999.4235.