Badger, S., Becchetti, M., Brancaccio, C., Hartanto, H. B., & Zoia, S. Numerical evaluation of two-loop QCD helicity amplitudes for gg → t t ¯ g $$ gg\to t\overline{t}g $$ at leading colour. SpringerOpen.
Chicago Style (17th ed.) CitationBadger, Simon, Matteo Becchetti, Colomba Brancaccio, Heribertus Bayu Hartanto, and Simone Zoia. Numerical Evaluation of Two-loop QCD Helicity Amplitudes for Gg → T T ¯ G $$ Gg\to T\overline{t}g $$ at Leading Colour. SpringerOpen.
MLA (9th ed.) CitationBadger, Simon, et al. Numerical Evaluation of Two-loop QCD Helicity Amplitudes for Gg → T T ¯ G $$ Gg\to T\overline{t}g $$ at Leading Colour. SpringerOpen.
Warning: These citations may not always be 100% accurate.