New Concepts in Magic Squares: Cornered Magic Rectangles in Construction of Magic Squares of Orders 28 and 30

This work brings magic squares of orders 28 and 30. These are constructed based on cornered magic rectangles and/or cornered magic squares. Order 28 is with four equal sums cornered magic squares of order 14x14. The order 30 is with four equal sums cornered magic rectangles. It is done with four types of centered magic squares of orders 6, 10, 14 and 18. In each case we have 3 different styles. Pdf file of the work is available at author's site.