On a criterion of Yakubovich type for the absolute stability of nonautonomous control processes. Fabbri, R., Impram, S.T., Johnson, R. (2003) International Journal of Mathematics and Mathematical Sciences
On Funnels of Multis and Their Behavior George Karakostas, Panagiotis Palamides (1999) Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
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On the estimation of averages over infinite intervals with an application to average persistence in population models. Ellermeyer, Sean (2009) JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]