TY  - RPRT
TI  - Union-Preserving Transformations of Differential-Elements.
AU  - E Kasner
AU  - J De Cicco
PY  - 1943
DO  - 10.1073/pnas.29.9.271
UR  - https://pubmed.ncbi.nlm.nih.gov/16578089/
ID  - 16578089
ER  -