HeI doubled emission lines from A0535+26 ≡ HDE 245770 - A possible interpretation F. Giovannelli, S. Bernabei, C. Rossi and L. Sabau-Graziati A&A, 475 2 (2007) 651-657 Published online: 18 June 2007 DOI: 10.1051/0004-6361:20066149