해당 리뷰는 다음 논문들을 재해석한 내용입니다.
Peters, Jonas, and Peter Bühlmann. "Identifiability of Gaussian structural equation models with equal error variances." Biometrika 101.1 (2014): 219-228.
Park, Gunwoong. "Identifiability of Additive Noise Models Using Conditional Variances"
Journal of Machine Learning Research 21.75 (2020): 1-34.