TY  - RPRT
TI  - Problems in working with dynamic groups.
AU  - N E Zinberg
AU  - L J Friedman
PY  - 1967
DO  - 10.1080/00207284.1967.11507739
UR  - https://pubmed.ncbi.nlm.nih.gov/6074777/
ID  - 6074777
ER  -