[1] Agarwal R. P., O’Regan D., Wong P. J. Y.: 
Positive solutions of differential, difference and integral equations. Kluwer Academic, Dordrecht 1999.  
MR 1680024 | 
Zbl 1157.34301[2] Agarwal R. P.: 
Boundary value problems for higher order differential equations. World Scientific, Singapore 1986.  
MR 1021979 | 
Zbl 0619.34019[3] Agarwal R. P.: 
Focal boundary value problems for differential and difference equations. Kluwer, Dordrecht 1998.  
MR 1619877 | 
Zbl 0914.34001[4] Agarwal R. P., O’Regan D., Lakshmikantham V.: 
Singular $(p,n-p)$ focal and $(n,p)$ higher order boundary value problems. Nonlinear Anal. 42 (2000), 215–228.  
MR 1773979 | 
Zbl 0977.34017[5] Eloe P. W., Henderson J.: 
Positive solutions for $(n-1,1)$ conjugate boundary value problems. Nonlinear Anal. 28 (1997), 1669–1680.  
MR 1430508 | 
Zbl 0871.34015[6] Feng W., Webb J. R. L.: 
Solvability of three-point boundary value problems at resonance. Nonlinear Anal. 30 (1997), 3227–3238.  
MR 1603039 | 
Zbl 0891.34019[7] Feng W., Webb J. R. L.: 
Solvability of $m$-point boundary value problems with nonlinear growth. J. Math. Anal. Appl. 212 (1997), 467–489.  
MR 1464891 | 
Zbl 0883.34020[8] Gupta C. P.: 
A sharper conditions for the solvability of three-point second order boundary value problem. J. Math. Anal. Appl. 205 (1997), 579–586.  
MR 1428372[9] Gupta C. P.: 
Solvability of a three-point nonlinear boundary value problem for a second order ordinary differential equation. J. Math. Anal. Appl. 168 (1992), 540–551.  
MR 1176010 | 
Zbl 0763.34009[10] Il’in V., Moiseev E.: Non-local boundary value problems of the second kind for a Sturm-Liouville operator. Differential Equations 23 (1987), 979–987. 
[11] Il’in V., Moiseev E.: Non-local boundary value problems of first kind for a Sturm-Liouville operator in its differential and finite difference aspects. Differential Equations 23 (1987), 803–810. 
[12] Liu B.: 
Solvability of multi-point boundary value problems at resonance (III). Appl. Math. Comput. 129 (2002), 119–143.  
MR 1897323[13] Liu B.: 
Solvability of multi-point boundary value problems at resonance (IV). Appl. Math. Comput. 143 (2003), 275–299.  
MR 1981696[14] Liu B., Yu J.: 
Solvability of multi-point boundary value problems at resonance (I). Indian J. Pure Appl. Math. 33(4) (2002), 475–494.  
MR 1902688 | 
Zbl 1021.34013[15] Liu B., Yu J.: 
Solvability of multi-point boundary value problems at resonance (II). Appl. Math. Comput. 136 (2003), 353–377.  
MR 1937938[16] Liu Y., Ge W.: 
Positive solutions for $(n-1,1)$ three-point boundary value problems with coefficient that changes sign. J. Math. Anal. Appl. 282 (2003), 816–825.  
MR 1989689 | 
Zbl 1033.34031[17] Liu Y., Ge W.: 
Solutions of a multi-point boundary value problem for higher-order differential equations at resonance (I). preprint.  
MR 2164671 | 
Zbl 1147.34005[18] Liu Y., Ge W.: 
Solutions of a multi-point boundary value problem for higher-order differential equations at resonance (III). preprint.  
MR 2147408 | 
Zbl 1088.34010[19] Ma R.: 
Existence theorems for a second order three point boundary value problem. J. Math. Anal. Appl. 212 (1997), 430–442.  
MR 1464888 | 
Zbl 0879.34025[20] Ma R.: 
Existence theorems for a second order $m$-point boundary value problem. J. Math. Anal. Appl. 211 (1997), 545–555.  
MR 1458512 | 
Zbl 0884.34024[21] Ma R.: 
Positive solutions of nonlinear three-point boundary value problems. Electron. J. Differential Equations 34 (1998), 1–8.  
MR 1713593[22] Mawhin J.: 
Toplogical degree methods in nonlinear boundary value problems. in: NSFCBMS Regional Conference Series in Math., American Math. Soc. Providence, RI 1979.  
MR 0525202[23] Mawhin J.: 
Toplogical degree and boundary value problems for nonlinear differential equations. in: P. M. Fitzpertrick, M. Martelli, J. Mawhin, R. Nussbanm (Eds.), Toplogical Methods for Ordinary Differential Equations, Lecture Notes in Math. 1537, Springer-Verlag, New York/Berlin, 1991.   
MR 1226930