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Number of items: **5**.

Yang, Bo:
*Positive solutions of the (n−1,1) conjugate boundary value problem.*
Electronic journal of qualitative theory of differential equations 53.
pp. 1-13. (2010)

Graef, John R. and Yang, Bo:
*Existence and nonexistence of positive solutions of a nonlinear third order boundary value problem.*
Electronic journal of qualitative theory of differential equations : proceedings of the colloquium on the qualitative theory of differential equations, (8) 9.
pp. 1-13. (2008)

Yang, Bo:
*Positive solution for a fourth order boundary value problem.*
Electronic journal of qualitative theory of differential equations 3.
pp. 1-17. (2005)

Graef, John R. and Qian, Chuanxi and Yang, Bo:
*Multiple positive solutions of a boundary value problem for ordinary differential equations.*
Electronic journal of qualitative theory of differential equations : proceedings of the colloquium on the qualitative theory of differential equations, (7) 11.
pp. 1-13. (2004)

Graef, John R. and Yang, Bo and Zhang, Bing Gen:
*A note on the existence of oscillatory solutions of higher order neutral differential equations.*
Acta scientiarum mathematicarum, (66) 1-2.
pp. 63-70. (2000)