Chen-Ning Franklin Yang AutographPrinted scientific article signed, three pages, 8 x 10,5 inch, scientific article entitled `Condition of Self Duality for SU(2) Gauge Fields on Euclidean Four Dimensional Space` by C. N. Yang reprint from `Physical Review Letters` (Vol. 38, 13 June 1977, No. 24), signed and inscribed on the front page in black felt tip "from the author C. N. Y.", with very mild signs of wear in nearly very fine condition.