Why are there errors in the bibtex returned by the ADS?
The bibtex generated by ADS works best for the journal data which is represented in a fairly standard way in the ADS. For conference data, however, the bibtex which we can generate automatically usually contains errors because the data contained in the ADS are not formatted uniformly. This makes it difficult for us to easily extract the editor and publisher information to format the entries correctly in Bibtex. Users should be aware that using the bibtex entries from the ADS most often requires some editing.