A minimum cost heterogeneous sensor network with a lifetime constraint

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Exploiting heterogeneity in sensor networks (2005, background): “Mhatre et al. [11] evaluated a hierarchical network with two types of nodes: sensors deployed with intensity λ0, and nodes with higher energy and communication capacity deployed with intensity λ1.”
An effective key management scheme for heterogeneous sensor networks (2007, background): “The performance evaluation and security analysis show that the key management scheme provides better security with low complexity and significant reduction on storage requirement, compared with existing key management schemes.”
Controlled sink mobility for prolonging wireless sensor networks lifetime (2008, background): “The use of mobile sinks with predictable mobility has been more recently presented in [32, 45, 46] and [9].”
Design Guidelines for Maximizing Lifetime and Avoiding Energy Holes in Sensor Networks with Uniform Distribution and Uniform Reporting (2006, background): “[17] considered a heterogeneous sensor network in which the nodes are to be deployed over a unit area for the purpose of surveillance.”
A dynamic clustering and energy efficient routing technique for sensor networks (2007, background): “The objective is to maximize the network lifetime, which can be the time until the first node dies out due to its energy depletion [13], or the number of successful data deliveries until a connectivity or coverage is lost [14].”