Torsion groups of elliptic surfaces

Miranda, Rick; Persson, Ulf

Compositio Mathematica, Volume 72 (1989) p. 249-267

Numerical sections on elliptic surfaces

Morrison, Ian; Persson, Ulf

Compositio Mathematica, Volume 59 (1986) p. 323-337

Chern invariants of surfaces of general type

Persson, Ulf

Compositio Mathematica, Volume 43 (1981) p. 3-58