Nguyen, T. V., Vu, C. D., Pham, T. B., Pham, V. H., Bui, H., Vu, T. H. H. and Pham, V. H. (2021) “Detection of Ultra-Low Concentration of Methylene Blue by Porous Silicon Photonic Crystals Covered With Siver Nanoparticles as Efficient Sers Substrate”, Communications in Physics, 31(4), p. 381. doi: 10.15625/0868-3166/15927.