[OS X TeX] citation in text fail to appear as expected

[konstantinos vasilakos]

And ----->
LaTeX Warning: Citation `citeulike:257255' on page 2 undefined on input line 24
.


LaTeX Warning: Citation `citeulike:1468371' on page 2 undefined on input line 2
8.

[2] (./Untitled.aux)

LaTeX Warning: There were undefined references.


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