Links for App

http://thenextweb.com/apps/2013/11/04/30-beautifully-designed-android-apps/8/ 
(some nice apps and logic behind their building)
http://mashable.com/2012/04/11/mobile-app-design-tips/ 
(10 mistakes not to make while designing app)
https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/Principles.html (nice design strategy )
