TY  - RPRT
TI  - Higher-derivative Lagrangians, nonlocality, problems, and solutions.
AU  - JZ Simon
PY  - 1990
DO  - 10.1103/physrevd.41.3720
UR  - https://pubmed.ncbi.nlm.nih.gov/10012315/
ID  - 10012315
ER  -