Feigin, B.L., Tsygan, B.L.: Additive K-theory and crystalline cohomology. Funktsional. Anal. i Prilozhen. 19, 52–62 (1985)
Feigin and Tsygan: Additive K-theory. In Cont. Math. vol 55, Part I.
arXiv: Experimental full text search
AG (Algebraic geometry), KT (K-theory)
Kth, Charp
According to nLab, additive K-theory is an old synonym for Cyclic homology. In particular, there seems to be no direct relation to additive Chow groups.
nLab page on Additive K-theory