@article{10_4064_ap_52_3_293_301,
     author = {M. Skwarczy\'nski},
     title = {The punctured plane: alternating projections and $L^2$-angles},
     journal = {Annales Polonici Mathematici},
     pages = {293--301},
     publisher = {mathdoc},
     volume = {52},
     number = {3},
     year = {1990},
     doi = {10.4064/ap-52-3-293-301},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-52-3-293-301/}
}