How to use the duecredit.collector.Citation function in duecredit

if path is None:
            raise ValueError('path must be provided')

        if isinstance(entry, DueCreditEntry):
            # new one -- add it
            self.add(entry)
            entry_ = self._entries[entry.get_key()]
        else:
            entry_ = self._entries[entry]

        entry_key = entry_.get_key()
        citation_key = Citation.get_key(path=path, entry_key=entry_key)
        try:
            citation = self.citations[citation_key]
        except KeyError:
            self.citations[citation_key] = citation = Citation(entry_, **kwargs)
        assert(citation.key == citation_key)
        # update citation count
        citation.count += 1

        # TODO: theoretically version shouldn't differ if we don't preload previous results
        if not citation.version:
            version = kwargs.get('version', None)

            if not version and citation.path:
                modname = citation.path.split('.', 1)[0]

                if '.' in modname:
                    package = modname.split('.', 1)[0]
                else:
                    package = modname

    @borrowdoc(Citation, "__init__", replace="PLUGDOCSTRING")
    def dcite(self, *args, **kwargs):
        """Decorator for references.  PLUGDOCSTRING

        Parameters
        ----------
        conditions: dict, optional
          If reference should be cited whenever parameters to the function call
          satisfy given values (all of the specified).
          Each key in the dictionary is a 2 element tuple with first element, integer,
          pointing to a position of the argument in the original function call signature,
          while second provides the name, thus if used as a keyword argument.
          Use "DC_DEFAULT" keyword as a value to depict default value (e.g. if no
          explicit value was provided for that positional or keyword argument).
          If "keyword argument" is of the form "obj.attr1.attr2", then actual value
          for comparison would be taken by extracting attr1 (and then attr2) attributes
          from the provided value.  So, if desired to condition of the state of the object,