N. O. Geokchyan, J. A. Mickaelyan, A. A. Eghiazaryan, and H. G. Khachatryan, “EXTRACTION-ABSORPTIOMETRIC DETERMINATION OF LEVOMICYTINE BY PIRONINE «B»”, Proc. YSU B: Chem. Biol. Sci., vol. 39, no. 3 (208), pp. 90–93, Oct. 2005.