Geodesic
On Transportable Forms
Canadian mathematical bulletin, Tome 15 (1972) no. 1, pp. 93-101

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In the theory of deformations of compact complex manifolds, the hypothesis of constancy of the dimension of diverse structural cohomology groups pertaining to a fibre plays an important role (see, for instance, [3, Propositions 2.5 and 2.7, Theorems 2.2 and 2.3, and Definition 6.1]). This paper is the first of two devoted to the investigation of conditions under which constancy of the dimension of given cohomology groups is assured, and more generally, to the study of the variation of that dimension.In [2] Griffiths introduces extendible forms in a holomorphic deformation. We consider in this paper a differentiate family, and besides extendible, also co-extendible and transportable forms (see §5), and deduce from their existence conclusions about the variation of the dimension of the corresponding structural cohomology groups. It is left to a subsequent paper to give more explicit conditions by means of cohomology operations, and to deal with some applications. 
Klemola, Tapio. On Transportable Forms. Canadian mathematical bulletin, Tome 15 (1972) no. 1, pp. 93-101. doi: 10.4153/CMB-1972-017-x
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     title = {On {Transportable} {Forms}},
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     number = {1},
     doi = {10.4153/CMB-1972-017-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-017-x/}
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