adj.having been made square

Curvature squared terms and string theories
Exact Mean Integrated Squared Error
What's wrong with mean-squared error?
Minimum mean squared error equalization using a priori information
Mean squared error: Love it or leave it? A new look at Signal Fidelity Measures
Testing the equality of prediction mean squared errors
Squared-Change Parsimony Reconstructions of Ancestral States for Continuous-Valued Characters on a Phylogenetic Tree
DIAGNOSTIC CHECKING ARMA TIME SERIES MODELS USING SQUARED‐RESIDUAL AUTOCORRELATIONS
Bovik, A.C.: Mean squared error: love it or leave it? - A new look at signal fidelity measures. IEEE Sig. Process. Mag. 26, 98-117
Eigenvalues of a Linear Fourth-Order Differential Operator with Squared Spectral Parameter in a Boundary Condition