Gravitational indexes

Definition:

m_i, m_j - atomic masses of atoms i and j

r_ij - interatomic distance of atoms i and j

N_a - number of atoms in the molecule

N_b - number of chemical bonds in the molecule

Reference:

1. A. R. Katritzky, L. Mu, V. S. Lobanov, M. Karelson, J. Phys. Chem., 1996, 100, 10400-10407.