Pachpatte inequalities on time scales. Akin-Bohner, Elvan, Bohner, Martin, Akin, Faysal (2005) JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
Positive solutions for a system of nonlinear boundary-value problems on time scales. Rao, A.Kameswara (2009) Electronic Journal of Differential Equations (EJDE) [electronic only]