A Comment on the Letter by Wentian Li and Per Bak Phys. Rev. Lett. 57, 655 (1986).
DOI:https://doi.org/10.1103/PhysRevLett.58.1046
©1987 American Physical Society
A. Block, H. J. Schellnhuber, and H. Urbschat
Vol. 58, Iss. 10 — 9 March 1987
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