\relax 
\citation{bla}
\citation{bla}
\citation{roth}
\citation{bla}
\citation{kim}
\citation{kim}
\citation{demir}
\citation{bla}
\citation{bla}
\citation{bilge}
\citation{khayat}
\citation{graham}
\citation{dosa}
\bibcite{bilge}{Bilge-Ulusoy 1995}
\bibcite{bla}{Blazewicz et al. 1991}
\bibcite{demir}{Demir-Vizv\'{a}ri 1995}
\bibcite{dosa}{Dosa 2004}
\bibcite{khayat}{El Khayat et al. 2006}
\bibcite{graham}{Graham 1969}
\bibcite{kim}{Roh-Kim 1997}
\bibcite{roth}{Rothkopf 1966}