LAYSIRIKUL, Ekkachai; 						SRIPON, Kitsanachai.
 A Noncommutative Semigroup which Contains the Natural Numbers under Addition and Its Left Ideals.
<strong>Naresuan University Journal: Science and Technology (NUJST)</strong>, [S.l.], v. 25, n. 2, p. 51-58, may 2017.
ISSN 2539-553X.
Available at: &lt;<a href="https://www.journal.nu.ac.th/NUJST/article/view/1778" target="_new">https://www.journal.nu.ac.th/NUJST/article/view/1778</a>&gt;. Date accessed: 25 apr. 2024.