Liu / NASSR Paper / June 27, 2001 / p. 8

 

                                                                                                                                                    Liu / Chap 1 / June 27, 2001 / p. 15

 

                                                                                                      Liu / NASSR Paper / June 27, 2001 / p. 30

 

                                                                                                                                      Liu / Notes, p. 13