On the maximum size of stepwise irregular graphs. - Lkhagva Buyantogtokh; Enkhbayar Azjargal; Batmend Horoldagva; Shiikhar Dorjsembe; Damchaa Adiyanyam (Appl. Math. Comput., 2021)

On graphs with maximum average eccentricity. - Batmend Horoldagva; Lkhagva Buyantogtokh; Shiikhar Dorjsembe; Enkhbayar Azjargal; Damchaa Adiyanyam (Discret. Appl. Math., 2021)

Graphs with maximum irregularity. - Shiikhar Dorjsembe; Lkhagva Buyantogtokh; Kinkar Chandra Das; Batmend Horoldagva (Comput. Appl. Math., 2022)

Exponential augmented Zagreb index of (n,m)-graphs. - Chunlei Xu; Lkhagva Buyantogtokh; Shiikhar Dorjsembe; Dechinpuntsag Bolormaa; Suyalabateer Bao (Discret. Appl. Math., 2025)