Shapovalova K B, Romanov S P, Dyubkacheva T A
Laboratory for the Physiology of Higher Nervous Activity, I. P. Pavlov Institute of Physiology, Russian Academy of Sciences, St. Petersburg, Russia.
Neurosci Behav Physiol. 1998 Jul-Aug;28(4):414-8. doi: 10.1007/BF02464797.