Template:SpringerEOM
Hazewinkel, Michiel, ed. (2001), “SpringerEOM”, Encyclopedia of Mathematics, Springer, ISBN 978-1-55608-010-4
Hazewinkel, Michiel, ed. (2001), “SpringerEOM”, Encyclopedia of Mathematics, Springer, ISBN 978-1-55608-010-4, https://www.encyclopediaofmath.org/index.php?title=Main_Page