@article{MS2_1978__43_166620,
     author = {Gerd Grubb},
     title = {Remainder estimates for eigenvalues and kernels of pseudo-differential elliptic systems.},
     journal = {Mathematica Scandinavica},
     pages = {275--307},
     year = {1978},
     volume = {43},
     zbl = {0407.35075},
     url = {http://geodesic.mathdoc.fr/item/MS2_1978__43_166620/}
}