Fractional power law susceptibility and specific heat in low-temperature insulating state of -K. Biljaković, M. Miljak, D. Starešinić, J. C. Lasjaunias, P. Monceau, H. Berger and F. LevyEurophys. Lett., 62 4 (2003) 554-560DOI: https://doi.org/10.1209/epl/i2003-00386-y