This video briefly reviews the following papers.
Park, Gunwoong. "Identifiability of Additive Noise Models Using Conditional Variances"
Journal of Machine Learning Research 21.75 (2020): 1-34.
Park, Gunwoong and Youngwhan Kim. "Identifiability of Gaussian Structural Equation Models with Homogeneous and Heterogeneous Error Variances" Journal of the Korean Statistical Society 49.1 (2020): 276-292.