@article {MATHEDUC.06270989,
author = {Trenkler, G\"otz and Schmidt, Karsten and Trenkler, Dietrich},
title = {Polar and singular value decomposition of $3\times 3$ magic squares.},
year = {2013},
journal = {International Journal of Mathematical Education in Science and Technology},
volume = {44},
number = {5},
issn = {0020-739X},
pages = {774-777},
publisher = {Taylor \& Francis, Abingdon, Oxfordshire},
doi = {10.1080/0020739X.2013.790507},
abstract = {Summary: In this note, we find polar as well as singular value decompositions of a $3\times 3$ magic square, i.e. a $3\times 3$ matrix $M$ with real elements where each row, column and diagonal adds up to the magic sum $s$ of the magic square.},
msc2010 = {K20xx (H60xx)},
identifier = {2014b.00739},
}