1. Brown, F., Schnetz, O.: Modular forms in quantum field theory. Commun. Number Theor. Phys. 7(2), 293–325 (2013)
2. Costa, E., Tschinkel, Y.: Variation of Neron-Severi ranks of reductions of K3 surfaces. Exp. Math. 23, 475–481 (2014)
3. Encyclopedia of Mathematics: Berlekamp-Massey algorithm.
https://www.encyclopediaofmath.org/index.php/Berlekamp-Massey_algorithm
4. Encyclopedia of Mathematics: Dirichlet convolution.
https://www.encyclopediaofmath.org/index.php/Dirichlet_convolution
5. Espeseth, A., Holmstrom, A., Vik, T.: New perspectives on multiplicative functions: Lambda-rings and Tannakian symbols. Preprint in preparation (draft version available upon request, but see also [6])