TY  - RPRT
TI  - On the loop approximation in nucleon QCD sum rules
AU  - Ryskin, M. G.
AU  - Sadovnikova, V. A.
PY  - 2015
DO  - 10.1134/s1063778815070054
UR  - https://www.osti.gov/biblio/22472091
ID  - 22472091
ER  -