Warren Buffett was reportedly bothered by high costs and complacency at the Gates Foundation FortuneHas the Long Friendship of Bill Gates and Warren Buffett Reached Its Final Act? The New York TimesWarren Buffett hates Bill Gates’ mismanagement at Gates Foundation: ‘Their friendship is over’ Hindustan TimesHow A Holiday Meeting Sparked A Billion-Dollar Friendship Between Bill Gates & Warren Buffett BenzingaHas friendship of Bill Gates and Warren Buffett reached final act? Business Standard