TY  - RPRT
TI  - GENERALIZED DERIVATIVES AND EXPANSIONS.
AU  - K Menger
AU  - S S Shü
PY  - 1955
DO  - 10.1073/pnas.41.8.591
UR  - https://pubmed.ncbi.nlm.nih.gov/16578450/
ID  - 16578450
ER  -