approximation method of interval number
curve approximation method
Finite difference approximation method
first-order approximation method
First-order Second-moment Approximation Method
Modified Successive Approximation Method
modified successive approximation method MSAM
piecewise approximation method
quasi-step function approximation method
right approximation method
spline approximation method
stochastic approximation method
Successive Approximation Method
tangential approximation method
acid hydrolyzation method and enzyme hydrolyzation method
cell- recurrence method and fractal box- counting method
CRD method cross diaphragm method
ethanol injection method combined with the ammonium sulphate gradients method