Götz Trenkler, G. P. Shannon. Hermitian Products of Hermitian Matrices: 11028. The American Mathematical Monthly, 112(4):370-371, 2005. [doi]
@article{TrenklerS05, title = {Hermitian Products of Hermitian Matrices: 11028}, author = {Götz Trenkler and G. P. Shannon}, year = {2005}, url = {http://www.jstor.org/stable/30037484}, researchr = {https://researchr.org/publication/TrenklerS05}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {112}, number = {4}, pages = {370-371}, }