Koulentianos, D., Fouda, A. E. A., Southworth, S. H., Bozek, J. D., Küpper, J., Santra, R., Kryzhevoi, N. V., Cederbaum, L. S., Bostedt, C., Messerschmidt, M., Berrah, N., Fang, L., Murphy, B., Osipov, T., Cryan, J. P., Glownia, J., Ghimire, S., Ho, P. J., Krässig, B., Ray, D., Li, Y., Kanter, E. P., Young, L., & Doumy, G. (n.d.). high intensity x-ray interaction with a model bio-molecule system: double-core-hole states and fragmentation of formamide. Journal of physics, 53, . http://access.bl.uk/ark:/81055/vdc_100116295180.0x00004a