C. G. Beneventano, I. V. Fialkovskii, E. M. Santangelo, “Zeros of combinations of Bessel functions and the mean charge of graphene nanodots”, TMF, 187:1 (2016), 58–73; Theoret. and Math. Phys., 187:1 (2016), 497–510
E. M. Santangelo, “Evaluation of Casimir Energies Through Spectral Functions”, TMF, 131:1 (2002), 98–117; Theoret. and Math. Phys., 131:1 (2002), 527–542
