HAM (this paper)

HPM [12]

HPM [13]

HBM [14]

HBM [15]

$A^{1/3}{\omega }_2$ (% error)

1.07086 (0.039%)

1.06861 (0.17%)

1.06991 (0.050%)

1.06928 (0.11%)

1.06341 (0.66%)