Wanted : Refs Singer, 40 Hz

[Ernir Sverrisson]

I am looking for references to papers by Singer and coworkers,
on the detection of a 40 Hz oscillation in mammal brains.

I am also looking for information in general about the existence
of a 40 Hz oscillation in the brain.

Thanks in advance.

Egill Masson,
Taugagreining hf,
Taeknigardi,
Dunhaga 5,
107 Reykjavik,
Iceland