Batra, R.C., and L. Chen. “Instability Analysis and Shear Band Spacing in Gradient-Dependent Thermoviscoplastic Materials With Finite Speeds of Thermal Waves”. Archives of Mechanics, vol. 53, no. 2, Mar. 2001, pp. 167-92, http://am.ippt.gov.pl/index.php/am/article/view/v53p167.