TY - BOOK AU - Mawhin,J. TI - Topological degree methods in nonlinear boundary valve problems T2 - Regional conference series in mathematics SN - 082181690x AV - QA379 M37 PY - 1979/// CY - Providence, r. i. PB - American mathematical society KW - Problemas de valores de frontera KW - Ecuaciones diferenciales funcionales KW - TopologĂ­a KW - Grados ER -