TY  - RPRT
TI  - Problems in measuring reciprocity with difference scores.
AU  - V P Tilden
AU  - B J Stewart
PY  - 1985
DO  - 10.1177/0092055x8500700314
UR  - https://pubmed.ncbi.nlm.nih.gov/3850705/
ID  - 3850705
ER  -