Home Page
About us
About PPEJ
Editor-in-Chief
Editorial Board
Staff
Partners
Explore Us
Instruction for Authors
A Message from the Editor-in-Chief
Celebrities who have collaborated with the PPE Journal
Membership in international indexes
Journal
New issue
Archive
Peer-review
Publishing ethics
Special Edition
Resources
Contact us
Journal :1981 №5
Download
View the archive
Abstract
