Harvard Business Review – Vol. 75, No. 6, 1997;
Harvard Business Review – Vol. 76, No. 5, 6, 1998;
Harvard Business Review – Vol. 77, No. 1, 2, 3, 1999;
Harvard Business Review – Vol. 77, No. 4, 5, 6, 1999;
Harvard Business Review – Vol. 78, No. 1, 2, 3, 2000;
Harvard Business Review – Vol. 78, No. 4, 5, 6, 2000;
Harvard Business Review – Vol. 79, No. 1, 2, -, 4, 2001;
Harvard Business Review – Vol. 79, No. 5, 6, 7, 2001;
Harvard Business Review – Vol. 79, No. 8, 9, -11, 2001:
Harvard Business Review – Vol.80, No. 1, 2, 3, 4, 2002;
Harvard Business Review – Vol. 80, No. 5, 6, 7, 8, 2002