Articles submitted should be original contributions and should not be under consideration for any other publication at the same time. If another version of the article is under consideration by another publication, or has been, or will be published elsewhere, authors should indicate this clearly at the time of submission.

Manuscripts should be typewritten on double side (justified) and 1.5 line spacing with ample margins. American spelling and punctuation should be used throughout (e.g., recognize, not recognise; color, not colour). All pages including notes (numbered at the end), maps, references, tabular material and appendices, should be numbered consecutively.