2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59682We analyze certain stationary fields with linear regressions and quadratic conditional variances. This classic probabilistic problem leads somewhat unexpectedly to stationary Markov processes closely tied to non-commutative probability through the q-Hermite polynomials.13 pagesProbabilityMathematical PhysicsOperator Algebras60E99text