Cisternas, M., Gadotti, D. A., Knapen, J. H., Kim, T., Díaz-García, S., Laurikainen, E., Salo, H., González-Martín, O., Ho, L. C., Elmegreen, B. G., Zaritsky, D., Sheth, K., Athanassoula, E., Bosma, A., Comerón, S., Erroz-Ferrer, S., Gil de Paz, A., Hinz, J. L., Holwerda, B. W., Laine, J., …Seibert, M. (2013). X-Ray Nuclear Activity in S$^4$G Barred Galaxies: No Link between Bar Strength and Co-occurrent Supermassive Black Hole Fueling. Astrophysical Journal, 776(1), https://doi.org/10.1088/0004-637x/776/1/50