@article{GDZPPN002308614, title = {Circle Actions on Homotopy Spheres Bounding Generalized Plumbing Manifoids.}, journal = {Mathematische Annalen}, volume = {201}, year = {1973}, pages = {201-210}, zbl = {0245.57015}, url = {http://dml.mathdoc.fr/item/GDZPPN002308614} }
Schultz, Reinhard. Circle Actions on Homotopy Spheres Bounding Generalized Plumbing Manifoids.. Mathematische Annalen, Tome 201 (1973) pp. 201-210. http://gdmltest.u-ga.fr/item/GDZPPN002308614/