books.google.co.in - "During the last several years, frames have become increasingly popular; they have appeared in a large number of applications, and several concrete constructions of frames of various types have been presented. Most of these constructions were based on quite direct methods rather than the classical sufficient...http://books.google.co.in/books/about/Frames_and_bases.html?id=trZM8tKSnkAC&q=vector+space&utm_source=gb-gplus-shareFrames and bases
