TY  - RPRT
TI  - Groups Containing Four and Only Four Non-Invariant Subgroups.
AU  - G A Miller
PY  - 1943
DO  - 10.1073/pnas.29.7.213
UR  - https://pubmed.ncbi.nlm.nih.gov/16578077/
ID  - 16578077
ER  -