R. Dowsley, G. Hanaoka, H. Imai, and A. Nascimento.
" Reducing the Ciphertext Size of Dolev-Dwork-Naor like Public Key Cryptosystems", in Proceedings of the 10th Brazilian Symposium on Information and Computational Systems Security, Fortaleza, 2010, pp. 395-404, doi: https://doi.org/10.5753/sbseg.2010.20602.