I am trying to cite a website but I am getting this message

Underfull \hbox (badness 1939) in paragraph at lines 9--11 

my citation is

author        = {k\&J magnetics},
year          = {2011},
title         = {The original K\&J magnet calculator},
howpublished  ={\url{https://www.kjmagnetics.com/calculator.asp}},
note = {Accessed 2020-2-30},

the packages I am using


%\usepackage[round, sort & compress]{natbib}
  • Please tell us whether you load the xurl package. (Hint: You should.)
    – Mico
    Sep 6, 2020 at 17:06
  • Maybe loading hyperref and deleting \url{...} from howpublished. Sep 6, 2020 at 17:07
  • I updated the question and added the packages I am using. What is the xur1 and how can I use it?
    – soooleh
    Sep 6, 2020 at 17:17
  • Luis, what do you mean by deleting \url
    – soooleh
    Sep 6, 2020 at 17:18
  • 1
    @soooleh and @Mico, my comment was clearly sloppy, what I mean is that is shouldn't be (or at least I believe) an \url inside a field when there is a dedicated field named url Sep 6, 2020 at 18:43

1 Answer 1


Some suggestions and observations:

  • To avoid getting warning messages about either underfull or overfull lines because of URL strings, load the xurl package before loading hyperref.

  • Since the elsarticle-num bibliography style recognizes a field called url, use it, i.e, replace howpublished = {\url{https://www.kjmagnetics.com/calculator.asp}}, with url = {https://www.kjmagnetics.com/calculator.asp},.

  • Encase the string K\&J in the title field in curly braces to keep it from getting lowercased by BibTeX.

  • Change the author field from {k\&J magnetics} to {{K\&J Magnetics}} so that the author is recognized as a "corporate" author and is sorted under K, not M.

  • With the elsarticle document class, it's better to specify times as a document class option than it is to load it as a package.

enter image description here

author        = {{K\&J Magnetics}},
year          = {2011},
title         = {The Original {K\&J} Magnet Calculator},
xxhowpublished= {\url{https://www.kjmagnetics.com/calculator.asp}},
url           = {https://www.kjmagnetics.com/calculator.asp},
note          = {Accessed 2020-2-30},

\bibliographystyle{elsarticle-num} % information gleaned from an earlier posting


\usepackage{xurl} % <-- new


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