However, the war followed him and soon the Nazi armies began occupying France. Bers applied for a visa to the USA and, while waiting to obtain permission, he wrote two papers on Green 's functions and integral representations.
Gayunman, ang digmaan sinundan sa kanya at sa lalong madaling panahon ang Nasi armies nagsimula occupying France. Bers-apply para sa isang visa sa USA, at habang naghihintay upang makakuha ng pahintulot, siya wrote dalawang mga papeles sa Green 's function at mahalaga isinasaad.