A. Hutem, “Comment on failure of excited-state energy calculation of analytical transfer matrix method for the potential
$V(x)=(1/2)kx^2+\lambda x^4$”, Ж. вычисл. матем. и матем. физ., 51:3 (2011), 470–479; Comput. Math. Math. Phys., 51:3 (2011), 435–443
