1. (a) Frierz-David, H.E.; Blangey, L. Fundamental Process of Dye Chemistry, Interscience Publishers, Inc.: New York, 1949; p. 311; (b) Zollinger H. Color Chemistry, Synthesis, Properties and Applications of Organic Dyes and Pigments, VCH Publishers: New York, 1987; p. 70; (c) The Chemistry and Application of Dyes, Waring, D.R.; Hallas, G. Eds.; Plenum Press: New York, 1990.
2. Indicators, Bishop, E. Ed.; Pergamon Press: New York, 1972; p. 503.
3. Caro, German Patent No. 1,886 (1877).
4. Sequence-Specific Interactions of Methylene Blue with Polynucleotides and DNA: A Spectroscopic Study
5. Incorporation of methylene blue in NaY zeolite at crystallographically defined positions