Michelle Esancy Bello, K. A., Shen, K., Zhao, D., Esancy, M., & Freeman, H. (2000). Dyes based on 5,10-dihydrophenophosphazine. Part I: Disazo direct dyes. DYES AND PIGMENTS, 46(3), 121–128. https://doi.org/10.1016/S0143-7208(00)00044-9 Freeman, H. S., Esancy, J. F., Claxton, L. D., & Esancy, M. K. (1991). Color, yes; cancer, no. Chemtech, 21(7), 438. FREEMAN, H. S., HSU, W. N., ESANCY, J. F., & ESANCY, M. K. (1988). PROTON MAGNETIC-RESONANCE SPECTRA OF SOME NAPHTHALENE DERIVATIVES. DYES AND PIGMENTS, 9(1), 67–82. https://doi.org/10.1016/0143-7208(88)85005-8 FREEMAN, H. S., ESANCY, J. F., ESANCY, M. K., MILLS, K. P., WHALEY, W. M., & DABNEY, B. J. (1987). AN APPROACH TO THE DESIGN OF NONMUTAGENIC AZO DYES .1. THE IDENTIFICATION OF NONMUTAGENIC PRECURSORS AND POTENTIAL METABOLITES. DYES AND PIGMENTS, 8(6), 417–430. https://doi.org/10.1016/0143-7208(87)85034-9