10."Bach-Khoa phong van gioi nhac si: Vo Duc Thu," Bach khoa 151 (15/4/1963), 101-106. Conversation with Le Yen, Hanoi, June 1995. Conversation with Hoang Trong, Mountain View, California, June 21, 1996. To Vu, Chi Vu, Thuy Loan. op. cit., 86. 11.ibid., 63-64. Pham Duy...