TY  - RPRT
TI  - Biofeedback: the need for a flexible approach.
AU  - V Huffer
PY  - 1979
DO  - 10.1016/s0033-3182(79)70799-7
UR  - https://pubmed.ncbi.nlm.nih.gov/515323/
ID  - 515323
ER  -