1. Good quantum error-correcting codes exist;Calderbank;Phys. Rev. A,1996
2. Error correcting codes in quantum theory;Steane;Phys. Rev. Lett.,1996
3. Simple quantum error-correcting codes,;Steane;Phys. Rev. A,1996
4. Quantum error correction and orthogonal geometry;Calderbank;Phys. Rev. Lett.,1997
5. Concatenated quantum codes;Knill,1996