@preamble{ "\newcommand{\nosort}[1]{}" }

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}
@BOOK{b2,
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   year = "2003",
}

@ARTICLE{b3,
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@ARTICLE{b6,
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}

@ARTICLE{b7,
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@ARTICLE{b8,
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@ARTICLE{b9,
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@article{b10,
  title = {Algebras of Multiplace Functions},
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  journal =  {Berlin. Boston: De Gruyter. (2012). Web. Retrieved 13 sep. (2013). from },
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  number =   5,
  pages =    {590--595},
  year =     1997,
  url =      {http://www.degruyter.com/view/product/179644},
}

@ARTICLE{b11,
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@ARTICLE{b12,
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@ARTICLE{b13,
   author = "K. Menger",
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@ARTICLE{b14,
   author = "K. Menger",
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   pages = "278--295",
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@ARTICLE{b15,
   author = "K. Menger and H. Whitlock",
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@ARTICLE{b16,
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@ARTICLE{b17,
   author = "T. Vougiouklis",
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   year = 1994,
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@ARTICLE{b18,
   author = "H. Whitlock",
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    number = 157,
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}