### Sums of squares and ~~modular number theory~~

#### Works connected to ~~Marvin Isadore Knopp~~

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Integers expressible in a given number of ways as a sum of two squares,” pp. 37–45 in A tribute to Emil Grosswald: Number theory and related analysis. Edited by M. I. Knopp and M. Sheingorn. Contemporary Mathematics 143. American Mathematical Society (Providence, RI), 1993. Dedicated to the memory of Elizabeth and Emil Grosswald. MR 1210510 Zbl 0790.11032 incollection

: “Some new old-fashioned modular identities,” Ramanujan J. 2 : 1–2 (1998), pp. 247–269. Dedicated to the memory of Paul Erdős. MR 1642881 Zbl 0909.11018 article

: “Sums of squares and the preservation of modularity under congruence restrictions,” pp. 59–71 in Symbolic computation, number theory, special functions, physics and combinatorics (Gainesville, FL, 11–13 November 1999). Edited by F. G. Garvan and M. E. H. Ismail. Developments in Mathematics 4. Kluwer Academic (Dordrecht), 2001. MR 1880079 Zbl 1040.11018 incollection

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