@article{MABA_2009_23_3-4_a6,
     author = {C. Papagianni and C. Pappas and N. Leflcaditis and I. Venieris},
     title = {A {Particle} {Swarm} {Optimization} {Approach} to the {Multi} {Level} {Capacitated} {Minimum} {Spanning} {Tree} {Problem}},
     journal = {Mathematica balkanica},
     pages = {303},
     publisher = {mathdoc},
     volume = {23},
     number = {3-4},
     year = {2009},
     url = {http://geodesic.mathdoc.fr/item/MABA_2009_23_3-4_a6/}
}