TY - BOOK AU - Agarwal, R. P. PY - 1998 DA - 1998// TI - Focal Boundary Value problems for Differential and Difference Equations, Mathematics and Its Applications PB - Kluwer Academic Publishers CY - Dordrecht, The Netherlands UR - https://doi.org/10.1007/978-94-017-1568-3 DO - 10.1007/978-94-017-1568-3 ID - Agarwal1998 ER - TY - BOOK AU - Zill, D. G. AU - Cullen, M. R. PY - 2001 DA - 2001// TI - Differential Equations with Boundary-Value Problems PB - Brooks/Cole CY - Belmont, Calif, USA ID - Zill2001 ER - TY - JOUR AU - Bai, Z. AU - Wang, H. PY - 2002 DA - 2002// TI - On positive solutions of some nonlinear fourth-order beam equations JO - Journal of Mathematical Analysis and Applications VL - 270 UR - https://doi.org/10.1016/S0022-247X(02)00071-9 DO - 10.1016/S0022-247X(02)00071-9 ID - Bai2002 ER - TY - JOUR AU - Graef, J. R. AU - Yang, B. PY - 1999 DA - 1999// TI - On a nonlinear boundary value problem for fourth order equations JO - Applicable Analysis VL - 72 UR - https://doi.org/10.1080/00036819908840751 DO - 10.1080/00036819908840751 ID - Graef1999 ER - TY - JOUR AU - Hao, Z. AU - Liu, L. AU - Debnath, L. PY - 2003 DA - 2003// TI - A necessary and sufficient condition for the existence of positive solutions of fourth-order singular boundary value problems JO - Applied Mathematics Letters VL - 16 UR - https://doi.org/10.1016/S0893-9659(03)80044-7 DO - 10.1016/S0893-9659(03)80044-7 ID - Hao2003 ER - TY - JOUR AU - Li, F. AU - Zhang, Q. AU - Liang, Z. PY - 2005 DA - 2005// TI - Existence and multiplicity of solutions of a kind of fourth-order boundary value problem JO - Nonlinear Analysis: Theory, Methods & Applications VL - 62 UR - https://doi.org/10.1016/j.na.2005.03.054 DO - 10.1016/j.na.2005.03.054 ID - Li2005 ER - TY - JOUR AU - Liu, B. PY - 2004 DA - 2004// TI - Positive solutions of fourth-order two point boundary value problems JO - Applied Mathematics and Computation VL - 148 UR - https://doi.org/10.1016/S0096-3003(02)00857-3 DO - 10.1016/S0096-3003(02)00857-3 ID - Liu2004 ER - TY - CHAP AU - Yang, D. AU - Zhu, H. AU - Bai, C. PY - 2007 DA - 2007// TI - Positive solutions for semipositone fourth-order two-point boundary value problems BT - Electronic Journal of Differential Equations ID - Yang2007 ER - TY - JOUR AU - Ma, R. PY - 1999 DA - 1999// TI - Positive solutions of fourth-order two-point boundary value problems JO - Annals of Differential Equations VL - 15 ID - Ma1999 ER - TY - JOUR AU - Torres, P. J. PY - 2003 DA - 2003// TI - Existence of one-signed periodic solutions of some second-order differential equations via a Krasnosel'skii fixed point theorem JO - Journal of Differential Equations VL - 190 UR - https://doi.org/10.1016/S0022-0396(02)00152-3 DO - 10.1016/S0022-0396(02)00152-3 ID - Torres2003 ER - TY - BOOK AU - Krasnosel'skii, M. A. PY - 1964 DA - 1964// TI - Positive Solutions of Operator Equations PB - P. Noordhoff CY - Groningen, The Netherlands ID - Krasnosel'skii1964 ER -