Retraction notice to "Investigating the efficiency in oil futures market based on GMDH approach" [Expert Systems with Applications 36 (2009) 7479-7483]

Mohsen Mehrara, Ali Moeini, Mehdi Ahrari, Ali Erfanifard. Retraction notice to "Investigating the efficiency in oil futures market based on GMDH approach" [Expert Systems with Applications 36 (2009) 7479-7483]. Expert Syst. Appl., 42(12):5401, 2015. [doi]

Abstract

Abstract is missing.