Gilchrist, T. L. 1992.Heterocyclic Chemistry,, 2nd. Ed., 189London: Longman.
Bean, G. P. 1990.In Pyrroles, Edited by: Jones, A. R. 105New York: Wiley. part 1
Burley I., 1995, Synthesis, 1151, 10.1055/s-1995-4068
Patterson J. M., 1976, Sythesis, 281, 10.1055/s-1976-24021
Sundberg, R. J. 1984.In Comprehensive Heterocyclic Chemistry, Edited by: Katritzky, A. R. and Rees, C. W. Vol. 4, 1–529. New York: Pergamon.
Niziurski-Mann R. E., 1992, Heterocycles, 34, 2003, 10.3987/REV-92-445
Masquelin T., 1995, Synthesis, 276, 10.1055/s-1995-3893
Dalton C. R., 1992, Tetrahedron Lett., 33, 5713, 10.1016/0040-4039(92)89013-3
Lask T. D., 1991, J. Heterocycl. Chem., 28, 1671, 10.1002/jhet.5570280705
Becker K. B., 1980, Tetrahedron, 38, 1717, 10.1016/0040-4020(80)80068-8
Himeda Y., 1995, J. Chem. Soc., Chem. Commun., 449, 10.1039/c39950000449
Schwaizer E. E., 1972, J. Org. Chem., 37, 1561, 10.1021/jo00975a022
Silverstein, R. M., Bassler, G. C. and Morrill, T. C. 1991.Spectrometric Identification of Organic Compounds,, 5th. ed., 183New York: Wiley. and 111