R. Fletcher, C. M. Reeves. Function minimization by conjugate gradients. Comput. J., 7(2):149-154, 1964. [doi]
@article{FletcherR64, title = {Function minimization by conjugate gradients}, author = {R. Fletcher and C. M. Reeves}, year = {1964}, doi = {10.1093/comjnl/7.2.149}, url = {https://doi.org/10.1093/comjnl/7.2.149}, researchr = {https://researchr.org/publication/FletcherR64}, cites = {0}, citedby = {0}, journal = {Comput. J.}, volume = {7}, number = {2}, pages = {149-154}, }