Koblizek, TI; Weiss, C; Yancopoulos, GD; Deutsch, U; Risau, W (1998). Angiopoietin-1 induces sprouting angiogenesis in vitro. Current Biology, 9(8), pp. 529-32. Cambridge, Mass.: Cell Press 10.1016/S0960-9822(98)70205-2