[1]Ali, A., Trinajstić, N. (2018) A novel/old modification of the first Zagreb index. Mol. Inform, 37: 6-7, 1800008 [2]Ali, A., Gutman, I., Milovanović, E., Milovanović, I. (2018) Sum of powers of the degrees of graphs: extremal results and bounds. MATCH Commun. Math. Comput. Chem, 80: 5-84 [3]Ali, A., Zhong, L., Gutman, I. (2019) Harmonic index and its generalizations: extremal results and bounds. MATCH Commun. Math. Comput. Chem, 81: 249-311 [4]Ali, U., Javaid, M., Kashif, A. (2020) Modified Zagreb connection indices of the T-sum graphs. Main Group Metal Chemistry, 43(1): 43-55 [5]Ashrafi, A.R., Došlić, T., Hamzeh, A. (2010) The Zagreb coindices of graph operations. Discrete Applied Mathematics, 158(15): 1571-1578 [6]Basavanagoud, B., Chitra, E. (2018) On the leap Zagreb indices of generalized xyz-point-line transformation graphs T xyz (G) when z = 1. Int. J. Math. Combin, 2: 44-66 [7]Basavanagoud, B., Patil, S. (2016) A note on hyper-zagreb index of graph operations. Iran. J. Math. Chem, 7(1): 89-92 [8]Bondy, J.A., Murty, U.S.R. (1976) Graph Theory with Applications. New York: Elsevier [9]Borovićanin, B., Das, K.C., Furtula, B., Gutman, I. (2017) Bounds for Zagreb indices. MATCH Commun. Math. Comput. Chem, 78: 17-100 [10]Borovićanin, B., Das, K.C., Furtula, B., Gutman, I. (2017) Zagreb indices, Bounds and extremal graphs. u: Gutman I.; Furtula B.; Das K.C.; Milovanoví E.; Milovanovíć I. [ur.] Bounds in Chemical Graph Theory Basics, Kragujevac: Univ. Kragujevac, 67-153 [11]Cao, J., Ali, U., Javaid, M., Huang, C. (2020) Zagreb connection indices of molecular graphs based on operations. Complexity, vol. 2020, Article ID 7385682 [12]Das, K.C., Gutman, I. (2004) Some properties of the second Zagreb index. MATCH Commun. Math. Comput. Chem, 52: 103-112 [13]Du, Z., Ali, A., Trinajstić, N. (2019) Alkanes with the fist thee maximal/minimal modified fist zageb connection indices. Molecular Informatics, 38: 1800116 [14]Ducoffe, G., Marinescu-Ghemeci, R., Obreja, C., Popa, A., Tache, R.M. (2018) Extremal graphs with respect to the modified first Zagreb connection index. u: Proceedings of the 16th Cologne-Twente Workshop on Graphs and Combinatorial Optimization, CNAM Paris, France June 18-20, 65-68 [15]Fatima, N., Bhatti, A.A., Ali, A., Gao, W. (2019) Zagreb connection indices of two dendrimer nanostars. Acta Chemica Iasi, 27(1): 1-14 [16]Gutman, I., Trinajstić, N. (1972) Graph theory and molecular orbitals. Total p-electron energy of alternant hydrocarbons. Chem. Phys. Lett, 17: 535-538 [17]Gutman, I., Furtula, B., eds. (2010) Novel molecular structure descriptorstheory and applications. Kragujevac: Univ. Kragujevac, vols. I-II [18]Gutman, I., Das, K.C. (2004) The first Zagreb index 30 years after. MATCH Commun. Math. Comput. Chem, 50: 83-92 [19]Gutman, I. (2011) Multiplicative Zagreb indices of trees. Bull. Soc. Math. Banja Luka, 18: 17-23 [20]Gutman, I., Furtula, B., Vukićević, K., Popivoda, G. (2015) On Zagreb indices and coindices. MATCH Commun. Math. Comput. Chem, 74(1): 5-16 [21]Gutman, I., Milovanović, E., Milovanović, I. Beyond the Zagreb indices. AKCE International Journal of Graphs and Combinatorics [22]Harary, F. (1969) Graph Theory. Reading, MA: Addison-Wesley [23]Khalid, S., Kok, J., Ali, A., Bashir, M. (2018) Zagreb connection indices of. TiO 2 nanotubes. Chemistry: Bulgarian J. Sci. Edu, 27: 86-92 [24]Manzoor, S., Fatima, N., Bhatti, A.A., Ali, A. (2018) Zagreb connection indices of some nanostructures. Acta Chemica Iasi, 26(2), in press [25]Naji, A.M., Soner, N.D., Gutman, I. (2017) On leap Zagreb indices of graphs. Commun. Comb. Optim, 2: 99-117 [26]Naji, A.M., Soner, N.D. (2018) The first leap Zagreb index of some graph operations. Int. J. Appl. Graph Theor, 2: 7-18 [27]Nikolić, S., Kovačević, G., Miličević, A., Trinajstić, N. (2003) The Zagreb indices 30 years after. Croat. Chem. Acta, 76: 113-124 [28]Noureen, S., Bhatti, A.A., Ali, A. (2020) Extremum modified first Zagreb connection index of n-vertex trees with fixed number of pendent vertices. Disc. Dyn. in Nat. and Soc, 3295342 [29]Noureen, S., Bhatti, A.A., Ali, A. (2020) On the Modified First Zagreb Connection Index of Trees of a Fixed Order and Number of Branching Vertices. Iranian J. Math. Chem, 11(4): 213-226 [30]Noureen, S., Bhatti, A.A. (2021) On the trees with given matching number and the modified first Zagreb connection index. Iranian J. Math. Chem, 12(3): 127-138 [31]Noureen, S., Ali, A., Bhatti, A.A. (2020) On the extremal Zagreb indices of n-vertex chemical trees with fixed number of segments or branching vertices. MATCH Commun. Math. Comput. Chem, 84: 513-534 [32]Noureen, S., Bhatti, A.A., Ali, A. (2020) Extremal trees for the modified first Zagreb connection index with fixed number of segments or vertices of degree 2. Journal of Taibah University for Science, 14(1): 31-37 [33]Todeschini, R., Consonni, V. (2000) Handbook of Molecular Descriptors. Weinheim: Wiley-VCH [34]Todeschini, R., Consonni, V. (2009) Molecular Descriptors for Chemoinformatics. Weinheim: Wiley-VCH [35]Ye, A., Qureshi, M.I., Fahad, A., Aslam, A., Jamil, M.K., Zafar, A., Irfan, R. (2019) Zagreb connection number index of nanotubes and regular hexagonal lattice. Open Chemistry, 17(1): 75-80 [36]Zhu, J.M., Dehgardi, N., Li, X. (2019) The third leap Zagreb index for trees. J. Chem, 9296401