aggregate constraint homotopy method
combined maximum entropy homotopy method
homotopy perturbation technique
hyperplane homotopy method
A Most Probable Point Perturbation Method
asymoptotic singular perturbation method
cavity perturbation method
Conditional Dynamic Perturbation Method
direct nodal perturbation method
direct perturbation method
electric current perturbation method
energy perturbation method
free-parameter perturbation method
generalized perturbation method
high-order small perturbation method
Improved perturbation method