Holmstrom Fibration

Fibrations are part of a model structure.

http://ncatlab.org/nlab/show/fibration+of+simplicial+sets

Fibrations (trivial cofibrations) are closed under pullbacks.

A variety of different notions of fibration can be found in HTT

http://www.ncatlab.org/nlab/show/fibrations+of+quasi-categories

nLab on Grothendieck fibration

http://ncatlab.org/nlab/show/fibration+sequence

http://mathoverflow.net/questions/49759/definition-of-fibration-in-algebraic-geometry

http://mathoverflow.net/questions/56563/why-does-homtopy-behave-well-with-respect-to-fibrations-and-homology-with-respect

nLab page on Fibration