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Le contentieux territorial entre le Maroc et l'Espagne
Lazrak, Rachid, (1974)
Kleines Spanien-Lexikon : Wissenswertes über Land und Leute
Haensch, Günther, (1989)
Spanien : Wirtschaft, Gesellschaft, Politik
Nohlen, Dieter, (1992)
The Fiscal Condition of American and Canadian Cities
Mercer, John, (1984)
Urban Form in Canada and the United States: an Examination of Urban Density Gradients
Edmonston, Barry, (1985)
Some considerations on the calculation of the velocity correlation function in the ring approximation, with application to the Lorentz gas
Keyes, T., (1979)