Topological electronic indices

Definition:

q_i- partial charge on the i-th atom

r_ij - distance between i-th and j-th atoms

N_SA - number of non-hydrogen atom in the molecule

N_b - number of bonds between non-hydrogen atom in the molecule

Reference:

1. K. Osmialowski, J. Halkiewicz, R. Kaliszan, J. Chromatogr., 1986, 63, 361.