@article{IM_1995__121_3_144309,
     author = {Gerd Grubb and Robert T. Seeley},
     title = {Weakly parametric pseudodifferential operators and {Atiyah-Patodi-Singer} boundary problems.},
     journal = {Inventiones mathematicae},
     pages = {481--530},
     publisher = {mathdoc},
     volume = {121},
     number = {3},
     year = {1995},
     zbl = {0851.58043},
     url = {http://geodesic.mathdoc.fr/item/IM_1995__121_3_144309/}
}