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Vadim, K., & Ke, Z. (2020-11-03). Normal Forms and Cohomology Classes at Single Resonances. In Arnold Diffusion for Smooth Systems of Two and a Half Degrees of Freedom: (AMS-208). : Princeton University Press. Retrieved 25 Jun. 2022, from https://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691202525.001.0001/upso-9780691202525-chapter-003.

Vadim, Kaloshin, and Zhang Ke. "Normal Forms and Cohomology Classes at Single Resonances." Arnold Diffusion for Smooth Systems of Two and a Half Degrees of Freedom: (AMS-208). : Princeton University Press,  20. Princeton Scholarship Online. Date Accessed 25 Jun. 2022 <https://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691202525.001.0001/upso-9780691202525-chapter-003>.

Vadim, Kaloshin, and Zhang Ke. "Normal Forms and Cohomology Classes at Single Resonances." In Arnold Diffusion for Smooth Systems of Two and a Half Degrees of Freedom: (AMS-208), by Kaloshin, Vadim, and Ke Zhang.. Princeton University Press, 2020. Princeton Scholarship Online, 2021. doi: 10.23943/princeton/9780691202525.003.0003.

Vadim K, Ke Z. Normal Forms and Cohomology Classes at Single Resonances. In: Arnold Diffusion for Smooth Systems of Two and a Half Degrees of Freedom: (AMS-208). Princeton University Press; 2020:24-30. https://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691202525.001.0001/upso-9780691202525-chapter-003. Accessed June 25, 2022.