TY - BOOK AU - Zill,Dennis G. AU - Cullen,Michael R. TI - Differential equations with boundary-value problems SN - 0534931588 AV - QA371 .Z55 1993 U1 - 515.35 20 PY - 1993///c CY - Boston PB - PWS-KENT KW - Differential equations KW - Boundary value problems N1 - Includes index ER -