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Picosecond fluorescence lifetime microscopy by TCSPC imaging.
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J.D. Mills, J.R. Stone, D.G. Rubin, D.E. Melon, D.O. Okonkwo, A. Periasamy, G.A. Helm:
Illuminating protein interactions in tissue using confocal and two-photon excitation fluorescent resonance energy transfer microscopy.
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V. Ulrich, P. Fischer, I. Riemann, K. König:

Compact multiphoton/single photon laser scanning microscope for spectral imaging and fluorescence lifetime imaging, Scanning 26, 217-225 (2004)