TY - Jour Au - Burlando，Laura Py - 1993Da - 1900/01/01 - Banach Algebra Sp - 163476 VL - 16 AB - SN - 0161-1712 UR - HTTPS：//DOI.ORG/10.1155/S0161171293001036 DO - 10.1155 / s0161171293001036 jf - 国际数学和数学科学Pb - Hindawi Publishing CorporationKW - ER -