@article{viana_2000,  title={Components of variation of polygenic systems with digenic epistasis},  volume={23},  ISSN={1415-4757},  url={https://doi.org/10.1590/S1415-47572000000400030},  DOI={10.1590/S1415-47572000000400030},  number={4},  journal={Genetics and Molecular Biology},  publisher={Sociedade Brasileira de Genética},  author={Viana, José Marcelo Soriano},  year={2000},  month={Dec},  pages={883–892} }