PaperOptimal iterative processes for root-findingRichard Brent, Shmuel Winograd, et al.Numerische Mathematik
PaperChecking the Calculation of GradientsPhilip WolfeACM Transactions on Mathematical Software (TOMS)
PaperValidation of subgradient optimizationMichael Held, Philip Wolfe, et al.Mathematical Programming