Freedman, M., Hain, R., & Teichner, P. (1997). Betti Number Estimates for Nilpotent Groups. In . Atiyah & . Iagolnitzer (Eds.), Fields Medallists’ Lectures (Vol. 5, pp. 413–434). River Edge, NJ: World Science. https://doi.org/10.1142/9789812385215_0045

Freedman, M., R. Hain, and P. Teichner. “Betti Number Estimates for Nilpotent Groups.” In Fields Medallists’ Lectures, edited by P. Atiyah and P. Iagolnitzer, 5:413–34. River Edge, NJ: World Science, 1997. https://doi.org/10.1142/9789812385215_0045.

Freedman M, Hain R, Teichner P. Betti Number Estimates for Nilpotent Groups. In: Atiyah, Iagolnitzer, editors. Fields Medallists’ Lectures. River Edge, NJ: World Science; 1997. p. 413–34.

Freedman, M., et al. “Betti Number Estimates for Nilpotent Groups.” Fields Medallists’ Lectures, edited by P. Atiyah and P. Iagolnitzer, vol. 5, World Science, 1997, pp. 413–34. Manual, doi:10.1142/9789812385215_0045.

Freedman M, Hain R, Teichner P. Betti Number Estimates for Nilpotent Groups. In: Atiyah, Iagolnitzer, editors. Fields Medallists’ Lectures. River Edge, NJ: World Science; 1997. p. 413–434.