1. “An improved upper bound for G (k) in Waring's problem for relatively small k,”;Balasubramanian;Acta Arith.,1984
2. “The asymptotic behaviour of a function occurring in the theory of primes,”;de Bruijn;J. Indian Math. Soc. (N.S.),1951
3. de Bruijn, N.G. “On the number of positive integers ≤x and free of prime factors >y,” Nederl. Acad. Wetensch. Proc. Ser. A. 54 (1951b), 50–60.
4. “On Waring's problem for n-th powers,”;Chen;Acta Math. Sinica.,1958
5. “On Waring's problem for fourth powers,”;Davenport;Ann. of Math.,1939