Fractional approach, quantum statistics, and non-crystalline solids at very low temperaturesE. K. Lenzi, B. F. de Oliveira, N. G.C. Astrath, L. C. Malacarne, R. S. Mendes, M. L. Baesso and L. R. EvangelistaEur. Phys. J. B, 62 2 (2008) 155-158DOI: https://doi.org/10.1140/epjb/e2008-00144-7