Problem with authors name with special character

[gkdgoutam]

Hi,

This plugin is very useful to download metadata from arxiv.org. However, when the author's names have special characters like umlaut etc. it does not work.

eg. https://arxiv.org/abs/2104.06416 where the second author has non-standard characters.
Is there any fix for this?

[gkdgoutam]

This is the error :

calibre, version 4.23.0
ERROR: No matches found:

Failed to find any books that match your search. Try making the search less specific. For example, use only the author's last name and a single distinctive word from the title.

To see the full log, click "Show details".

Running identify query with parameters:
{u'identifiers': {}, u'authors': None, u'title': u'2104.06416', u'timeout': 30}
Using plugins: Arxiv (1, 3, 0), Google (1, 0, 2), Amazon.com (1, 2, 18)
The log from individual plugins is below

****************************** Arxiv (1, 3, 0) ******************************
Found 0 results
Downloading from Arxiv took 1.07860088348

---

****************************** Google (1, 0, 2) ******************************
Found 0 results
Downloading from Google took 0.378719091415
Making query: https://books.google.com/books/feeds/volumes?q=intitle%3A2104.06416&min-viewability=none&start-index=1&max-results=20

---

****************************** Amazon.com (1, 2, 18) ******************************
Found 0 results
Downloading from Amazon.com took 0.764371871948
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36
Server: auto
Making google query: https://www.google.com/search?q=2104.06416+site%3Awww.amazon.com
Failed to find any results on results page, with title: 2104.06416 site:www.amazon.com - Google Suche
No search engine results for terms: 2104.06416
Trying the bing search engine instead
Making bing query: https://www.bing.com/search?q=2104.06416+site%3Awww.amazon.com
Failed to find any results on results page, with title: 2104.06416 site:www.amazon.com - Bing
No search engine results for terms: 2104.06416
No matches found with query: [u'2104.06416']

---

The identify phase took 1.22 seconds
The longest time (1.078601) was taken by: Arxiv
Merging results from different sources
We have 0 merged results, merging took: 0.00 seconds