On a similar note, it seems that the link with crossref may be broken. Cannot fetch bibtex info based on the doi, e.g. 10.1016/j.enpol.2019.03.001 returns nothing (“Cannot get info based on given doi”) while https://search.crossref.org/?q=10.1016%2Fj.enpol.2019.03.001 finds it easily. The crossref web search from JabRef returns a bunch of articles but not the actual one. Has the API Changed or anything else?
JabRef 4.3.1
Windows 10 10.0 x86
Java 1.8.0_201