One of the best sources for the study of obsolescence is the book "Strategies to the Prediction, Mitigation, and Management of Product Obsolescence" by Bjorn Bartels, et al. Check your local library or Google books to get a copy.
Information on planned obsolescence can be found from many different resources. Some examples of online resources for this information include Information Week and The Daily Green.
economic obsolescence
Obsolescence is a noun.
One can find information on Kumuka Worldwide on the official Kumuka website. There one can find information and contact details for the company. One can also find information on their Facebook page.
One can find more information about culling on Wikipedia where they have much information on the procedure and how it is implemented. One can also find information on 'HowStuffWorks'.
obsolescene
One can find information on the covariance matrix on the Wikipedia website where there is much information about the mathematics involved. One can also find information on Mathworks.
Managerial Obsolescence is a situation where Managers cannot keep up with the latest technology or are not as well-qualified.
One can find information about Madden in a variety of places. For example, one can find information about Madden from its official Wikipedia entry. One can also find information about Madden from the EA SPORTS website.
One can find information about a cricket ground on the ESPN Cricinfo website where they have information on all the major grounds. One can also find information on Wikipedia.
One can find helpful information about IT maintenance from IBM's official website. There one will find information on IT maintenance for different network devices.
One can find information on companies named Biozone on their respective official websites. One can find information on the scientific phenomena on Wikipedia.