TY  - RPRT
TI  - Variational Principle for Eigenvalue Problems of Hamiltonian Systems.
AU  - RD Benguria
AU  - MC Depassier
PY  - 1996
DO  - 10.1103/physrevlett.77.2847
UR  - https://pubmed.ncbi.nlm.nih.gov/10062067/
ID  - 10062067
ER  -