@article{heully:jpa-00248144,
  TITLE = {{On Some Attempts to Generalize the Effective Hamiltonian Approach}},
  AUTHOR = {Heully, Jean-Louis and Evangelisti, Stefano and Durand, Philippe},
  URL = {https://hal.archives-ouvertes.fr/jpa-00248144},
  JOURNAL = {{Journal de Physique II}},
  PUBLISHER = {{EDP Sciences}},
  VOLUME = {5},
  NUMBER = {1},
  PAGES = {63-74},
  YEAR = {1995},
  DOI = {10.1051/jp2:1995100},
  PDF = {https://hal.archives-ouvertes.fr/jpa-00248144/file/ajp-jp2v5p63.pdf},
  HAL_ID = {jpa-00248144},
  HAL_VERSION = {v1},
}