by Ullman, Daniel H., Zeitz, Paul
Published in The American mathematical monthly (14.09.2023)

by Ullman, Daniel H., Zeitz, Paul
Published in The American mathematical monthly (22.08.2022)

by Krusemeyer, Mark, Ullman, Daniel H.
Published in The American mathematical monthly (14.09.2018)

by Robinson, Jr., E. Arthur, Ullman, Daniel H
Year of Publication 2010

by Ullman, Daniel H., Velleman, Daniel J.
Published in The American mathematical monthly (16.03.2019)

by Ullman, Daniel H., Zeitz, Paul
Published in The American mathematical monthly (13.09.2024)

by Ullman, Daniel H
Published in Notices of the American Mathematical Society (01.10.2022)

by Ullman, Daniel H
Published in Notices of the American Mathematical Society (01.08.2021)

by Krusemeyer, Mark, Ullman, Daniel H.
Published in The American mathematical monthly (13.09.2020)

by Krusemeyer, Mark, Ullman, Daniel H.
Published in The American mathematical monthly (14.09.2019)

by Krusemeyer, Mark, Ullman, Daniel H
Published in The American mathematical monthly (01.10.2019)

by Ullman, Daniel H., Velleman, Daniel J.
Published in The American mathematical monthly (14.09.2021)

by Ullman, Daniel H., Velleman, Daniel J.
Published in The American mathematical monthly (02.09.2021)

by Ullman, Daniel H., Velleman, Daniel J., Wagon, Stan, West, Douglas B.
Published in The American mathematical monthly (20.10.2024)

by Ullman, Daniel H., Velleman, Daniel J., Wagon, Stan, West, Douglas B.
Published in The American mathematical monthly (07.10.2024)

by Ullman, Daniel H., Velleman, Daniel J., Wagon, Stan, West, Douglas B.
Published in The American mathematical monthly (13.09.2024)

by Ullman, Daniel H., Velleman, Daniel J., Wagon, Stan
Published in The American mathematical monthly (16.03.2022)

by Ullman, Daniel H., Velleman, Daniel J., Wagon, Stan
Published in The American mathematical monthly (16.03.2022)

by Ullman, Daniel H., Velleman, Daniel J., Wagon, Stan, West, Douglas B.
Published in The American mathematical monthly (08.08.2024)

by Ullman, Daniel H., Velleman, Daniel J., Wagon, Stan, West, Douglas B.
Published in The American mathematical monthly (02.07.2024)