@article{gimelfarb_1981, title={A general linear model for the genotypic covariance between relatives under assortative mating}, volume={13}, DOI={10.1007/BF00275215}, number={2}, journal={Journal of Mathematical Biology}, author={Gimelfarb, A.}, year={1981}, pages={209} }
 @article{gimelfarb_1981, title={Analysis of "nontraditional" relationships under assortative mating}, volume={13}, DOI={10.1007/BF00275216}, number={2}, journal={Journal of Mathematical Biology}, author={Gimelfarb, A.}, year={1981}, pages={227} }