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Jin-Yi Cai and D. Sivakumar. Sparse hard sets for P: resolution of a conjecture of Hartmanis. Journal of Computer and System Sciences, volume 58, issue 2. стр. 280-296. 1999. ISSN0022-0000. At CiteseerАрхивирано на сајту Wayback Machine (9. новембар 2007)
worldcat.org
Jin-Yi Cai and D. Sivakumar. Sparse hard sets for P: resolution of a conjecture of Hartmanis. Journal of Computer and System Sciences, volume 58, issue 2. стр. 280-296. 1999. ISSN0022-0000. At CiteseerАрхивирано на сајту Wayback Machine (9. новембар 2007)