Boltznitulescu, G., Bazin, H., & Spiegelberg, HL. (1981). Specificity of Fc-receptors for Igg2a, Igg1-igg2b, and Ige On Rat Macrophages. The Journal of Experimental Medicine, 154(2), 374-384. https://doi.org/10.1084/jem.154.2.374 (Original work published 1981)