Arumtiwi, Andi Atirah, et al. “Minimum Variance Quadratic Unbiased Estimation Approach in Panel Data Regression Analysis With Two-Way Error Component Estimation Using Biggers Method ”. Jurnal Matematika, Statistika Dan Komputasi, vol. 21, no. 2, Jan. 2025, pp. 439-55, doi:10.20956/j.v21i2.37325.