Narasimhan Srinivasan Kachadourian, R., Srinivasan, N., Haney, C. A., & Stevens, R. D. (2001). An LDI-TOF and ESI mass spectrometry study of a series of beta-substituted cationic metalloporphyrins. JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 5(6), 507–511. https://doi.org/10.1002/jpp.354 Srinivasan, N., Haney, C. A., Lindsey, J. S., Zhang, W. Z., & Chait, B. T. (1999). Investigation of MALDI-TOF mass spectrometry of diverse synthetic metalloporphyrins, phthalocyanines and multiporphyrin arrays. JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 3(4), 283–291. https://doi.org/10.1002/(SICI)1099-1409(199904)3:4<283::AID-JPP132>3.0.CO;2-F