To cite bgw estimation algorithms in publications use:
Bunch D, Gay D, Welsch R (1993).“Algorithm 717-Subroutines for maximum likelihood and quasi-likelihood estimation of parameters in nonlinear regression models.”ACM Transactions on Mathematical Software,19(1), 21.doi:10.1145/151271.151279,https://dl.acm.org/doi/10.1145/151271.151279.
Corresponding BibTeX entry:
@Article{, title = {Algorithm 717-Subroutines for maximum likelihood and quasi-likelihood estimation of parameters in nonlinear regression models}, author = {David S. Bunch and David M. Gay and Roy E. Welsch}, journal = {ACM Transactions on Mathematical Software}, year = {1993}, volume = {19}, number = {1}, pages = {21}, doi = {10.1145/151271.151279}, url = {https://dl.acm.org/doi/10.1145/151271.151279}, }