For these, readers can refer, for instance, to the review by Tolman et al. and references therein.
Frequently expected advantages of using virtual learning environments refer, for instance, to the efficiency, individuality, ubiquity, timeliness and learning task orientation.
For other details we refer, for instance, to the book by Hino et al. [42].
The interested reader may refer, for instance, to Le Ravalec et al. (2014) for more details.
For these oscillatory and nonoscillatory results, we refer, for instance, to [1 23].
For newer results, the reader should refer, for instance, to [6 8].
When we refer, for instance, to adolescent GAD symptoms, we are speaking of self-reported GAD symptoms.
The interested readers are referred, for instance, to [20, 24, 25] for detailed accounts.
The reader is referred, for instance, to [2] and [3] for an introduction to the theory of ordered sets.
Another set of important concepts refers, for instance, to collective behaviour or the transformation of social systems.
