The establishment of EVISA is funded by the EU through
the Fifth Framework Programme (G7RT- CT- 2002- 05112).
Supporters of EVISA includes:
Chelation involves coordination of more than one sigma-electron pair
donor group from the same ligand to the same central atom. The number
of coordinating groups in a single chelating ligand is indicated by the
adjectives didentate, tridentate, tetradentate, etc..
The term "chelation" was found in the following pages: