@STRING{IEEE_J_SP = "{IEEE} Trans. Signal Process."}
this definition is a part of the standard IEEEabrv.bib collection

@article{sd13,
	Author = {Song, Zhao and Dogandžić, Aleksandar},
	Journal = IEEE_J_SP,
	Title = {A Max-Product {EM} Algorithm for Reconstructing
                  {Markov}-tree Sparse Signals from Compressive
                  Samples},
        volume=61, 
        number=23, 
        pages={5917-5931}, 
	year = 2013}