CHAU, Tran Tho.
 Theorem of standard form for sele-modifying some closure propertier and decision problem.
<strong>VNU Journal of Science: Natural Sciences and Technology</strong>, [S.l.], v. 12, n. 3, sep. 1996.
ISSN 2588-1140.
Available at: &lt;<a href="https://js.vnu.edu.vn/NST/article/view/4104" target="_new">https://js.vnu.edu.vn/NST/article/view/4104</a>&gt;. Date accessed: 29 apr. 2024.