Antonio Frangioni Solving semidefinite quadratic problems within nonsmooth optimization algorithms. 1099-1118 1996 23 Comput. Oper. Res. 11 https://doi.org/10.1016/0305-0548(96)00006-8 https://www.wikidata.org/entity/Q118165530 db/journals/cor/cor23.html#Frangioni96