Ii. Balitsky et Vm. Braun, INSTANTON-INDUCED CONTRIBUTIONS TO STRUCTURE FUNCTIONS OF DEEP-INELASTIC SCATTERING, Physics letters. Section B, 314(2), 1993, pp. 237-245
We identify and calculate the instanton-induced contributions to deep
inelastic scattering which correspond to nonperturbative exponential c
orrections to the coefficient functions in front of parton distributio
ns of the leading twist.