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Comment: 22 pages, LaTeX, Published version
An Ising model with ferromagnetic nearest-neighbor interactions $J_{1}$ ($J_{1}>0$) and random next-nearest-neighbor interactions [$+J_{2}$ with probability $p$ and $-J_{2}$ with probability $(1-p)$; $J_{2}>0$] is studied within the framework of an effective-field theory based on the differential-operator technique. The order parameters are calculated, considering finite clusters with $n=1,2, {\rm and} 4$ spins, using the standard approximation of neglecting correlations. A phase diagram is obtained in the plane temperature versus $p$, for the particular case $J_{1}=J_{2}$, showing both superantiferromagnetic (low $p$) and ferromagnetic (higher values of $p$) orderings at low temperatures.
Comment: 30 pages,5 figures. Minor updates
Comment: 27 pages, 10 figures, Phys. Rev. B (in press)
Comment: 13 pages, RevTeX style, 3 EPS figures
Comment: 5 pages, 4 figures, 2-column revtex format. To be submitted to PRE
Comment: 4 pages, 3 figures, submitted to PRL
Comment: Published version
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