This module is waiting for a re-write (the author needs to find some tuits) because the Harvard ADS webservice has changed. It's currently third in the queue of things I need to do.
ETA - early 2020.
Thu Nov 07 03:17:39 2019The RT System itself - Status changed from 'new' to 'open'
Wed Feb 17 17:03:07 2021DUFFEE [...] cpan.org - Correspondence added