P.K., Siva Kumar, et al. “Investigation On The Crystal Structure, Third-Order Nonlinear Optical And Thermal Studies Of 4-Nitroanilinium 5-Sulfosalicylic Acid Monohydrate Single Crystal”. Photonics Letters of Poland, vol. 7, no. 4, Dec. 2015, pp. pp. 106-108, doi:10.4302/photon. lett. pl.v7i4.602.