I was reading the explanation about
thebibliography and was totally confused:
thebibliographyenvironment has an argument which should be a string at least the length of the widest entry label in the source list. Instead of using the numbers generated by the environment as entry labels, you can specify your own by using an optional argument to
\bibitem, but remember to increase the length of the argument to the
What does "widest entry label" mean? Practically, what should I put as the argument in
or is the argument not necessary?