I've found the exact references :
Shah, M. J., Using transistor arrays for temperature compensation, published in Elecronics, April 12 1973, p. 103. The complete title might be "Electronics : the international magazine of electronics technology and business".
Shah, M. J., Self-regulating temperature stabilized reference, published in EDN, May 20 1974, p. 74-6
If anybody has a print version of those issues, or live nearby a college library that has them... If someone here happens to live in Switzerland, EPFL Lausanne seems to have the first one on their shelves, and ETH Zurich the latter.