@article{10_1007_s10492_006_0011_0,
     author = {Strouboulis, Theofanis and Hidajat, Realino},
     title = {Partition of unity method for {Helmholtz} equation: $q$-convergence for plane-wave and wave-band local bases},
     journal = {Applications of Mathematics},
     pages = {181--204},
     publisher = {mathdoc},
     volume = {51},
     number = {2},
     year = {2006},
     doi = {10.1007/s10492-006-0011-0},
     mrnumber = {2212312},
     zbl = {1164.65505},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-006-0011-0/}
}