HS 0139+0559, HS 0229+8016, HS 0506+7725, and HS 0642+5049: four new long-period cataclysmic variables
, , , , , , , , ,A&A, 443 3 (2005) 995-1005
Published online: 15 November 2005
DOI: 10.1051/0004-6361:20042610