@article {keskin2014wireless, title = {Wireless sensor network lifetime maximization by optimal sensor deployment, activity scheduling, data routing and sink mobility}, journal = {Ad Hoc Networks}, volume = {17}, year = {2014}, pages = {18{\textendash}36}, publisher = {Elsevier}, author = {Keskin, M Emre and I. Kuban Altinel and Necati Aras and Ersoy, Cem} } @article {keskin2011lifetime, title = {Lifetime maximization in wireless sensor networks using a mobile sink with nonzero traveling time}, journal = {The Computer Journal}, year = {2011}, pages = {bxr048}, publisher = {Oxford University Press}, author = {Keskin, M Emre and I. Kuban Altinel and Necati Aras and Ersoy, Cem} }