(EN) J. Jehlicka, Žácek V., Edwards H. G. M., Shcherbakova E., Moroz T., Raman spectra of organic compounds kladnoite (C6H4(CO)2NH) and hoelite (C14H8O2) - Rare sublimation products crystallising on self-ignited coal heaps (abstract), in Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy, vol. 68, n. 4, 2007, pp. 1053-1057, DOI:10.1016/j.saa.2007.02.009.
handbookofmineralogy.org
John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols, Handbook of Mineralogy (PDF), Chantilly, VA 20151-1110, Mineralogical Society of America.
(EN) J. Jehlicka, Žácek V., Edwards H. G. M., Shcherbakova E., Moroz T., Raman spectra of organic compounds kladnoite (C6H4(CO)2NH) and hoelite (C14H8O2) - Rare sublimation products crystallising on self-ignited coal heaps (abstract), in Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy, vol. 68, n. 4, 2007, pp. 1053-1057, DOI:10.1016/j.saa.2007.02.009.