I have a explanatory variable that is also endogenous and i want to include its square term as explanatory variable in the model. I'm using system GMM to estimate the model because  it also has a lag of dependent variable on RHS and endogeneity is also a issue in this model ...Kindly suggest some papers to be used as references which uses square term of endog. variable as one of explanatory variable in system gmm?

Thanks

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