1. Caravenna, F., Chaumont, L.: Invariance principles for random walks conditioned to stay positive. Annales de l’IHP Probabilités et statistiques 44(1), 170–190 (2008)
2. Feller, W. (ed.): An Introduction to Probability Theory and Its Applications. Wiley, Princeton University, New York (1970)
3. Spitzer, L. (ed.): Principles of Random Walks. D. van Nostrand Company, New York (1964)
4. Greenwood, P., Shaked, M.: Fluctuations of random walk and storage systems. Adv. Appl. Probab. 9(3), 556–587 (1977)
5. Kingman, J.F.C.: On the algebra of queues. J. Appl. Probab. 3(2), 285–326 (1966)