@article{10_1007_s10492_015_0104_8,
     author = {Brandts, Jan H. and Reis da Silva, Ricardo},
     title = {On the subspace projected approximate matrix method},
     journal = {Applications of Mathematics},
     pages = {421--452},
     publisher = {mathdoc},
     volume = {60},
     number = {4},
     year = {2015},
     doi = {10.1007/s10492-015-0104-8},
     mrnumber = {3396473},
     zbl = {06486919},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-015-0104-8/}
}