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"To: J.M. van den Akker, J.H. Koolen and R.J.M. Vaessens, "Perfect codes ..."
- To: J.M. van den Akker, J.H. Koolen and R.J.M. Vaessens, "Perfect codes with distinct protective radii", Discrete Mathematics 81 (1990) 103-109. Discret. Math. 89(3): 325 (1991)
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