B. Vlčková, P. Šmejkal, M. Michl, M. Procházka, P. Mojzeš, F. Lednický, and J. Pfleger. Surface-enhanced resonance Raman spectroscopy of porphyrin and metalloporphyrin species in systems with Ag nanoparticles and their assemblies. Journal of Inorganic Biochemistry, Elsevier BV, volume 79, issue 14, April 2000.