Study Backs Theory of 'Grassy Knoll' (washingtonpost.com)
"D.B. Thomas, a government scientist and JFK assassination researcher, said it was more than 96 percent certain that there was a shot from the grassy knoll to the right of the president's limousine, in addition to the three shots from a book depository window above and behind the president's limousine."

Study Backs Theory of 'Grassy Knoll' (washingtonpost.com)
"D.B. Thomas, a government scientist and JFK assassination researcher, said it was more than 96 percent certain that there was a shot from the grassy knoll to the right of the president's limousine, in addition to the three shots from a book depository window above and behind the president's limousine."