TY  - RPRT
TI  - Is yawning a cholinergic response?
AU  - R Urbá-Holmgren
AU  - R M González
AU  - B Holmgren
PY  - 1977
DO  - 10.1038/267261a0
UR  - https://pubmed.ncbi.nlm.nih.gov/865617/
ID  - 865617
ER  -