White, Halbert (1980). «A Heteroskedasticity-Consistent Covariance Matrix Estimator and a Direct Test for Heteroskedasticity». Econometrica48 (4): 817-838. JSTOR1912934. doi:10.2307/1912934.
White, Halbert (1980). «A Heteroskedasticity-Consistent Covariance Matrix Estimator and a Direct Test for Heteroskedasticity». Econometrica48 (4): 817-838. JSTOR1912934. doi:10.2307/1912934.