Goyal, K., G. Neubig, C. Dyer, and T. Berg-Kirkpatrick. “A Continuous Relaxation of Beam Search for End-to-End Training of Neural Sequence Models”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 32, no. 1, Apr. 2018, doi:10.1609/aaai.v32i1.11806.