Two column

• How to Put Page Numbers on the Left and Right Corners in LaTeX
  Use fancyhdr’s even/odd page fields to put page numbers on the outer corners: right on odd pages and left on even pages, including two-column documents.
• How to Make a Full-Width Abstract in KOMA-Script
  Use KOMA-Script's two-column mode and place the title and abstract in a full-width \twocolumn block before the paper text.