s.unc.edu/~welch/kalman/s.unc.edu/~welch/kalman/kalmanIntro.htmls.google.com.sg/books?id=A37UDLcwQMAC&dq=kalman+filter&printsec=frontcover&source=in&hl=en&ei=H6D3SYDyII-dkAWLyc3fCg&sa=X&oi=book_result&ct=result&resnum=13
s.unc.edu/~welch/kalman/
s.unc.edu/~welch/kalman/kalmanIntro.html
s.google.com.sg/books?id=A37UDLcwQMAC&dq=kalman+filter&printsec=frontcover&source=in&hl=en&ei=H6D3SYDyII-dkAWLyc3fCg&sa=X&oi=book_result&ct=result&resnum=13