## Linear Programming And Extensions Bibtex Bibliography

I am writing for the first time in LaTeX. The bibliography was a bit flaky at first, but it worked - I got the citation numbers in the text, and the references listed at the end of the document. At some point however, LaTeX stopped recognizing citations, and I have no idea what caused it.

The compiled document has a question mark instead of a citation number:

And the log file warns me that it doesn't find the citations.

LaTeX Warning: Citation `Alexander2009' on page 1 undefined on input line 22. LaTeX Warning: Citation `Sutcliffe2011' on page 1 undefined on input line 22.However, I have defined the citations, and they look exactly like all the examples I could find for correct citations.

Preamble:

\documentclass{llncs} \usepackage{array} \usepackage{colortbl} \usepackage{rotating}The paragraphs which include a citation look like that:

Requirements engineering (RE) methods are usually based on information about the stakeholders' business goals, business processes and organization structure~\cite{Alexander2009}. Only a few approaches take ``soft issues'' such as values, emotions, and motivation of the users in consideration. However, there is a trend emerging in RE, which encourages scientists and practitioners to pay attention to such issues, as evidenced for example by the tutorial on emotions in RE at the RE'11 conference~\cite{Sutcliffe2011}.The document ends with

\section{References} \label{sec:references} \bibliographystyle{llncs} \bibliography{RefsQ12_sources-only}And I tried all possible formats for citations in RefsQ12_sources-only.bib. The first item is manually entered in the fashion of some manual I found in the internet, the second one was entered in the TexmakerX GUI for creating new BibTex items, and the third is exported from Mendeley. None works.

@book{Alexander2009, address = "Chichester", author = "Alexander, Ian and Beus-Dukic, Ljerka", edition = "1", isbn = "978-0470712405", pages = "457", publisher = "Wiley", title = "Discovering Requirements", year = "2009" } @InProceedings{Sutcliffe2011, author = {Alistair Sutcliffe}, title = {Emotional Requirements Engineering}, booktitle = {19th IEEE conference on requirements engineering}, pages = {321--322}, year = {2011}, } @article{Schwartz1990, author = {Schwartz, S H and Bilsky, W}, journal = {Journal of personality and social psychology}, number = {5}, pages = {878--891}, publisher = {American Psychology Association}, title = {{Toward a theory of the universal content and structure of values: Extensions and cross-cultural replications}}, volume = {58}, year = {1990} }I use MikTex with TexmakerX, but I also compiled from the command line and got the same result.

When I removed the BibTex reference and used a environment instead, the citations worked. However, I prefer to use a BibTex file, because then I can export all the data from Mendeley, instead of building the whole bibliography pre hand. Any ideas what went wrong?

bibtex

In real-world problems related to finance, business, and management, mathematicians and economists frequently encounter optimization problems. In this classic book, George Dantzig looks at a wealth of examples and develops linear programming methods for their solutions. He begins by introducing the basic theory of linear inequalities and describes the powerful simplex method used to solve them. Treatments of the price concept, the transportation problem, and matrix methods are also given, and key mathematical concepts such as the properties of convex sets and linear vector spaces are covered.

George Dantzig is properly acclaimed as the "father of linear programming." Linear programming is a mathematical technique used to optimize a situation. It can be used to minimize traffic congestion or to maximize the scheduling of airline flights. He formulated its basic theoretical model and discovered its underlying computational algorithm, the "simplex method," in a pathbreaking memorandum published by the United States Air Force in early 1948. *Linear Programming and Extensions* provides an extraordinary account of the subsequent development of his subject, including research in mathematical theory, computation, economic analysis, and applications to industrial problems.

Dantzig first achieved success as a statistics graduate student at the University of California, Berkeley. One day he arrived for a class after it had begun, and assumed the two problems on the board were assigned for homework. When he handed in the solutions, he apologized to his professor, Jerzy Neyman, for their being late but explained that he had found the problems harder than usual. About six weeks later, Neyman excitedly told Dantzig, "I've just written an introduction to one of your papers. Read it so I can send it out right away for publication." Dantzig had no idea what he was talking about. He later learned that the "homework" problems had in fact been two famous unsolved problems in statistics.

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