Columbia subject headings:
Particles (Nuclear physics)--Congresses.
Perturbation (Quantum dynamics)--Congresses.
Quantum chromodynamics--Congresses.
Harvard subject headings:
Perturbation (Quantum dynamics)--Congresses.
Quantum chromodynamics--Congresses.
Princeton subject headings:
Perturbation (Quantum dynamics)--Congresses.
Quantum chromodynamics--Congresses.