In this article, we determine all equivariant compactifications of the three-dimensional vector group that are smooth Fano threefolds with Picard number greater than or equal to two.
"Fano Threefolds as Equivariant Compactifications of the Vector Group." Michigan Math. J. 69 (2) 341 - 368, May 2020. https://doi.org/10.1307/mmj/1576033218