To cite the 'Ryacas' package in publications use:
Andersen M, Højsgaard S (2019).“Ryacas: A computer algebra system in R.”Journal of Open Source Software,4(42).https://doi.org/10.21105/joss.01763.
Corresponding BibTeX entry:
@Article{, title = {{Ryacas: A computer algebra system in R}}, author = {Mikkel Meyer Andersen and Søren Højsgaard}, journal = {Journal of Open Source Software}, year = {2019}, volume = {4}, number = {42}, url = {https://doi.org/10.21105/joss.01763}, }