Bak P, Tang C, Wiesenfeld K.
Comment on "relaxation at the angle of repose". Physical Review Letters. 1989;(1):110-.
Tang C, Nakanishi H, Langer JS.
Droplet model for autocorrelation functions in an Ising ferromagnet. Physical Review A. 1989;(2):995-1003.
Wiesenfeld K, Tang C, Bak P.
A physicist's sandbox. Journal of Statistical Physics. 1989;(5-6):1441-1458.
Bak P, Tang C.
Earthquakes as a self-organized critical phenomenon. Journal of Geophysical Research. 1989;(B11):15,635-15,637.