Short Distance vs. Long Distance Physics: The Classical Limit of the   Minimal Length Uncertainty Relation
  We continue our investigation of the phenomenological implications of the "deformed" commutation relations [x_i,p_j]=i hbar[(1 + beta p^2) delta_{ij} + beta' p_i p_j]. These commutation relations are motivated by the fact that they lead to the minimal length uncertainty relation which appears in perturbative string theory. In this paper, we consider the effects of the deformation on the classical orbits of particles in a central force potential. Comparison with observation places severe constraints on the value of the minimum length. 
Sandor Benczik, Lay Nam Chang, Djordje Minic, Naotoshi Okamura,   Saifuddin Rayyan, and Tatsu Takeuchi