Almost Hermitian structures on the frame bundle of an almost Hermitian manifold R. Castro; A. Tarrio — 1990 Annales Polonici Mathematici
Almost Complex Structure in the Frame Bundle of an Almost Contact Metric Manifold. A. Bonome; R. Castro; L.M. Hervella — 1986 Mathematische Zeitschrift
On certain structures on the frame bundle of an almost para-contact metric manifold Bonome, A.; Castro, R.; Tarrio, A. — 1988 Portugaliae mathematica
Homotopía e inyectividad. José R. Caruncho Castro; Constantino Touzón Pérez — 1974 Collectanea Mathematica