Ines Kohl. 2009. Beautiful Modern Nomads: Bordercrossing Tuareg between Niger, Algeria and Libya. Berlin.
“The Ishumar, a group of “new modern nomads” are borderliners who move between Niger, Algeria, and Libya, and in doing so not only cross territorial borders, but also social and societal boundaries and barriers. It is characteristic of the Ishumar that their way of life is one beyond traditional systems. They break away from traditional norms and values, select special elements, change them, and place them into a new context. Their ideas, concepts and ideals of beauty and aesthetics, values and morals, can be regarded as an indicator of sociocultural changes in the Sahara.”
You can see a number of pictures from the book and read an extract over at the site of Ines Kohl.