When trying to get my .bib file into my .tex i get this error message.

You're missing a field part---line 52 of file Bib.bib
 :  howpublished = 
 :            "{\url{https://www.cs.cmu.edu/afs/cs.cmu.edu/academic/class/15859-f11/www/notes/lecture05.pdf}}"     
I'm skipping whatever remains of this entry

In my .tex file i start my bibliogrphy as follows:


My .bib file for this url with the error message is as follows:

author = "Anupam Gupta",
title = "Linear Programming Duality",
howpublished = "{\url{https://www.cs.cmu.edu/afs/cs.cmu.edu/academic/class/15859-f11/www/notes/lecture05.pdf}}"

My preamble is large but it is as follow:

\usepackage{graphicx} % For including graphics (via \includegraphics).
\usepackage{amsmath}  % Improves typographic quality of mathematical output.
\usepackage{amsfonts} % For mathematical fonts.
\usepackage{amsthm} % Needed to typeset theorem environments.
\usepackage[affil-it]{authblk} % Needed for author and affiliation.
\usepackage{amsopn} % Allows the declaration of new mathematical operators.
\usepackage{amssymb} % Extended set of mathematical symbols.
\usepackage{mathrsfs} % Raph Smith's mathematical script font.
\usepackage{booktabs} % Improves the typographical quality of tables.
\usepackage{natbib} % Citations and bibliography.
\usepackage{tikz} % Extends the figure generation capabilities of LaTeX.
\usepackage{algorithm} % Necessary for including algorithmic structures.
\usepackage{float} % Allows the creation of own floating environments.
\usepackage{caption} % Allows the customisation of captions.
\usepackage{abstract} % For including abstracts in documents.
\usepackage{listings} % For the inclusion of source code.
\usepackage{color} % Used for colour commands.
\usepackage{pgfplots} %extends tikz functionality
  • 1
    I'm just guessing, but the howpublished entry is delimited by two single quotes (''). But usually the delimiter is one double quote ("). Change to double quotes to see what happens. – Phelype Oleinik Feb 15 '18 at 15:18
  • 1
    Welcome to TeX.SX! You can also use braces instead of " (which TeXworks has the bad habit to change into ''). – egreg Feb 15 '18 at 15:20
  • @PhelypeOleinik - you should post your comment as an answer. :-) – Mico Feb 15 '18 at 15:20
  • 3
    Off-topic: The hyperref package should be loaded last. Also: no need to load the tikz package -- or any other package... _ twice. – Mico Feb 15 '18 at 15:22
  • 1
    @Mico Done :). I'm not at the computer, so I wasn't sure. – Phelype Oleinik Feb 15 '18 at 15:27

The problem is the delimiter of the howpublished field.

The valid separators for bibtex files are double quotes (" ") and curly braces ({ }).

The file you posted is using a pair of single quotes ('' '') and this is breaking bibtex.

Change your entry to either:

author = "Anupam Gupta",
title = "Linear Programming Duality",
howpublished = "\url{https://www.cs.cmu.edu/afs/cs.cmu.edu/academic/class/15859-f11/www/notes/lecture05.pdf}"


author = "Anupam Gupta",
title = "Linear Programming Duality",
howpublished = {\url{https://www.cs.cmu.edu/afs/cs.cmu.edu/academic/class/15859-f11/www/notes/lecture05.pdf}}

and it will work.

(make sure you delete the .aux and .bbl files to force texmaker run bibtex again :)

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