Minghua Lin, Gord Sinnamon. A Condition for Convexity of a Product of Positive Definite Quadratic Forms. SIAM J. Matrix Analysis Applications, 32(2):457-462, 2011. [doi]
@article{LinS11-22,
title = {A Condition for Convexity of a Product of Positive Definite Quadratic Forms},
author = {Minghua Lin and Gord Sinnamon},
year = {2011},
doi = {10.1137/110821196},
url = {http://dx.doi.org/10.1137/110821196},
researchr = {https://researchr.org/publication/LinS11-22},
cites = {0},
citedby = {0},
journal = {SIAM J. Matrix Analysis Applications},
volume = {32},
number = {2},
pages = {457-462},
}