Notes, Comments and Preliminary results May 06 2020 Kahina Cherfi-Feroukhi and Saïd Souam   Informal economy, government intervention and labor market in Algeria: An analysis by structural models   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result   May 15 2019 Kahina Cherfi-Feroukhi and Said Souam   Formal and Informal Interactions in a Duopoly Model   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result