The documentation for the atomic descriptor SigmaElectronegativityDescriptor has no reference as where this descriptor is taken from, and the documentation is sparse at best.
Patrik, this one, I'm afraid, I do not know...
Checking this document.... http://qsar.sourceforge.net/dicts/qsar-descriptors/index.xhtml
OK, these are the Gasteiger-Marsili sigma partial charges:
OK, a patch with some info is available from:
Patrik, btw, also notice the "Dictionary pointer(s):" section in the class JavaDoc and the links within, but I appreciate you need to know about that.
Patch was applied and pushed.
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