✓

@book{GrayFPS_2022,
    author = {Gray, W. Steven},
    title = {Formal Power Series Methods in Nonlinear Control Theory},
    year = {2021},
    edition = {1.2},
    url = {http://www.ece.odu.edu/~sgray/fps-book},
    date-added = {2025-3-11 15:27:27 +0100}
}

@book{GrayFPS_2022, author = {Gray, W. Steven}, title = {Formal Power Series Methods in Nonlinear Control Theory}, year = {2021}, edition = {1.2}, url = {http://www.ece.odu.edu/~sgray/fps-book}, date-added = {2025-3-11 15:27:27 +0100} }