Willard I. Zangwill. Minimizing a function without calculating derivatives. Comput. J., 10(3):293-296, 1967. [doi]
@article{Zangwill67-0,
title = {Minimizing a function without calculating derivatives},
author = {Willard I. Zangwill},
year = {1967},
doi = {10.1093/comjnl/10.3.293},
url = {https://doi.org/10.1093/comjnl/10.3.293},
researchr = {https://researchr.org/publication/Zangwill67-0},
cites = {0},
citedby = {0},
journal = {Comput. J.},
volume = {10},
number = {3},
pages = {293-296},
}