High Levels of IgA Anticardiolipin Antibodies in Patients with Systemic Lupus erythematosus, Henoch-Schoenlein Purpura, Sneddon’s Syndrome and Recurrent Pregnancy Loss - Baleva, Marta; Boyanovsky, Boris; Nikolov, Krasimir; Kolarov, Zlatimir; Nikolova, Milena (Thrombosis and Haemostasis, 1999)