@article{10_4064_ap_67_3_203, author = { }, title = {Acknowledgements}, journal = {Annales Polonici Mathematici}, pages = {203--203}, year = {1997}, volume = {67}, number = {3}, doi = {10.4064/ap-67-3-203}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-67-3-203/} }