Journal of Statistical Physics, Vol. 35, Nos. 5/6, 1984. p. 507-516.
We study a percolation process in which both sites and bonds are randomly blocked, independent of each other. In the Bethe lattice, the exact solution for the percolation threshold is found to be a hyperbola in the x-p plane, where x and p are the respective probabilities of each site arid bond being unblocked. Percolation threshold for a square and a simple cubic lattice is obtained by computer simulation. We also present a result obtained by a real-space renormalization group technique for the square lattice.