Another approach for the traveling salesman problem. - Vites Longani (Appl. Math. Comput., 2000)

On the operator ⊕k related to the wave equation and Laplacian. - Amnuay Kananthai; Suthep Suantai; Vites Longani (Appl. Math. Comput., 2002)

A formula for the number of labelled trees. - Vites Longani (Comput. Math. Appl., 2008)