Volume 18, Issue 4 Xiaoxue Han Fu Sun Eigenvalues of indefinite q-Sturm-Liouville problem with q-coupled boundary condition 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 Xiaoxue Han Fu Sun Find more articles with the same keywords Indefinite q-Sturm-Liouville problem non-real eigenvalues upper bounds q-coupled boundary condition Find more articles with the same subject classes 39A13 34B05 34B24 34L15 47B50