High nonlinear optical anisotropy of urea nanofibersD. Isakov, E. de Matos Gomes, M. Belsley, B. Almeida, A. Martins, N. Neves and R. ReisEPL, 91 2 (2010) 28007DOI: https://doi.org/10.1209/0295-5075/91/28007
