1. R. A. Brualdi and B. L. Shader, Matrices of Sign-Solvable Linear Systems, Cambridge Tracts Math., 116, Cambridge Univ. Press, Cambridge (1995).
2. G. Dolinar, A. Guterman, and B. Kuzma, “On Gibson barrier for the P´olya problem,” Fundam. Prikl. Mat. (accepted).
3. G. Dolinar, A. Guterman, and B. Kuzma, “P´olya convertibility problem for symmetric matrices,” Mat. Zametki (accepted).
4. G. Dolinar, A. Guterman, B. Kuzma, and M. Orel, “On the Pólya permanent problem over finite fields,” Eur. J. Combin., 32, No. 1, 116–132 (2011).
5. P. Erdős and A. Rényi, “On random matrices,” Magyar Tud. Akad. Mat. Kutató Int. Kozl., 8, 455–461 (1964).