Green and Schwarz discovered a contribution to the anomaly that Witten and Alvarez-Gaumé had missed, which restricted the gauge group of the type I string theory to be SO(32).
Green a Schwarz objavili príspevok k anomálii, ktorý Witten a Alvarez-Gaumé nepostrehli, ktorý obmedzil kalibračnú skupinu strunovej teórie typu I na (32).