Mallinson, P. R., Smith, G. T., Wilson, C. C., Grech, E., & Wozniak, K. (2003). From weak interactions to covalent bonds: a continuum in the complexes of 1,8-bis(dimethylamino)naphthalene. Journal Of The American Chemical Society, 125(14), 4259-70. https://doi.org/10.1021/ja029389b (Original work published 2003)