Volume 9, Issue 4 Bo Yang Maximum Principle for a fourth order boundary value problem 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 Bo Yang Find more articles with the same keywords upper and lower bounds for the Green function maximum principle beam equation positive solution Find more articles with the same subject classes 34B18 34B15