Sponholz, B.; Baumhauer, R.; Felix-Henningsen, P. (27 July 2016). "Fulgurites in the southern Central Sahara, Republic of Niger and their palaeoenvironmental significance". The Holocene. 3 (2): 97–104. CiteSeerX10.1.1.549.8976. doi:10.1177/095968369300300201.
Sponholz, B.; Baumhauer, R.; Felix-Henningsen, P. (27 July 2016). "Fulgurites in the southern Central Sahara, Republic of Niger and their palaeoenvironmental significance". The Holocene. 3 (2): 97–104. CiteSeerX10.1.1.549.8976. doi:10.1177/095968369300300201.