Carvalho, Pedro G. and Sonis, Michael (2007): A Life experiment of development Mountain tourism in Portugal observed from the point of view of theories of Complexity, Complication and Self-organization. Unpublished.
Guilhoto, Joaquim J.M.; Hewings, Geoffrey J.D. and Sonis, Michael (2002): Productive relations in the northeast and the rest of Brazil regions in 1995: decomposition & synergy in input-output systems. Unpublished.