@article{Michalska,
    author = {Maria Michalska},
    title = {Real nullstellensatz and sum of squares},
    date-added = {2023-11-20 9:32:50 +0100}
}

@article{Michalska, author = {Maria Michalska}, title = {Real nullstellensatz and sum of squares}, date-added = {2023-11-20 9:32:50 +0100} }