On primary relations at tree-level in string theory and field theory

Direct Proof of the Tree-Level Scattering Amplitude Recursion Relation in Yang-Mills Theory

Ruth Britto, Freddy Cachazo, Bo Feng et al. · Physical Review Letters · 2005 · 1.4K citations · Full text

Tree-level Scattering Amplitudes, One-loop Scattering Amplitudes, Yang-mills Theory +9

A relation between tree amplitudes of closed and open strings

H. Kawai, D. C. Lewellen, S.-H. Henry Tye · Nuclear Physics B · 1986 · 1.2K citations

Tree Language, Tree Automaton, Tree Amplitudes +1

New relations for gauge-theory amplitudes

Zvi Bern, John Joseph M. Carrasco, Henrik Johansson · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 2008 · 1.1K citations · Full text

New recursion relations for tree amplitudes of gluons

Ruth Britto, Freddy Cachazo, Bo Feng · Nuclear Physics B · 2005 · 999 citations · Full text

Representation Theory, Natural Sciences, Particle Physics +4

Perturbative Quantum Gravity as a Double Copy of Gauge Theory

Zvi Bern, John Joseph M. Carrasco, Henrik Johansson · Physical Review Letters · 2010 · 957 citations · Full text

Multiloop Gravity Amplitudes, Supergravity, Physics +8