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\begin{thebibliography}{1}

\bibitem{friman:1990}
H.~Friedman and R.~Mansfield, {\em Algorithmic procedures}, Trans. Amer. Math.
  Soc. {\bf 332} (199?), 297--312, Available by anonymous ftp from
  ftp.math.psu.edu. See file, pub/psu-papers/README.

\bibitem{vand:1949}
B.L. Van~der Waerden, {\em Modern algebra}, vol.~1, Frederick Ungar Publishing
  Co., New York, 1949.

\end{thebibliography}