Volume 4, Issue 1 Zhang Shiqing Sundman's inequalities in N-body problems and their applications Downloads Abstract PDF Full article PDF DOI { copied = true; setTimeout(() => copied = false, 2000) })" :aria-label="copied ? 'DOI copied' : 'Copy DOI'" :title="copied ? 'Copied' : 'Copy DOI'" > Find all available articles from these authors Zhang Shiqing Find more articles with the same keywords N-body problems period energy angular momentum the momentum of inertia Find more articles with the same subject classes 34C25 34C15 58Fxx 70F10