On squares, outside guessing of clubs and $I_{ by Dzamonja and Shelah. [DjSh:562]
Fundamenta Math, 1995
Suppose that lambda = mu^+ . We consider two aspects of the square property on subsets of lambda . First, we have results which show e.g. that for aleph_0 <= kappa =cf (kappa)< mu, the equality cf([mu]^{<= kappa}, subseteq)= mu is a sufficient condition for the set of elements of lambda whose cofinality is bounded by kappa, to be split into the union of mu sets with squares. Secondly, we introduce a certain weak version of the square property and prove that if mu is a strong limit, then this weak square property holds on lambda without any additional assumptions

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