TY  - RPRT
TI  - Ankylosing spondylitis and sleep.
AU  - M Tanfield
PY  - 1978
DO  - 10.1016/s0140-6736(78)90727-4
UR  - https://pubmed.ncbi.nlm.nih.gov/76886/
ID  - 76886
ER  -