RETRACTED: Establishment and solution of the model for loop pipeline network with multiple heat sources

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of the Editor-in-Chief and Author.This article has been retracted at the request of the authors with agreement from the editor, as it was brought to the attention of the authors that they had copied, without permission, sections of another author's doctoral thesis.