TY - JOUR AU - Kato, Ma. TI - Compact Differentiable 4-Folds with Quaternionic Structures. JO - Mathematische Annalen PY - 1980 VL - 248 SP - 79 EP - 96 KW - quaternionic structures; complex affine structures; almost quaternionic structure; 4-manifolds UR - http://eudml.org/doc/163369 ER -