id: 03706249
dt: j
an: 03706249
au: Himmelblau, D.M.; Lindsay, J.W.
ti: An evaluation of subsitute methods for derivatives in unconstrained
    optimization.
so: Oper. Res. 28, 668-686 (1980).
py: 1980
pu: INFORMS, Hanover, MD
la: EN
cc: 
ut: evaluation of substitute methods; derivatives; unconstrained optimization;
    finite difference approximations; test problems; comparison of
    algorithms; numerical study
ci: 
li: doi:10.1287/opre.28.3.668