@article{NUMA_1992__62_1_133662,
     author = {Martin Costabel and William McLean},
     title = {Spline collocation for strongly elliptic equations on the torus.},
     journal = {Numerische Mathematik},
     pages = {511--538},
     year = {1992},
     volume = {62},
     number = {1},
     zbl = {0767.65079},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1992__62_1_133662/}
}