MathSciNet bibliographic data MR1185266 (94i:47004) 47A10 (47A62) Du, Hong Ke; Jin, Pan Perturbation of spectrums of $2\times 2$$2\times 2$ operator matrices. Proc. Amer. Math. Soc. 121 (1994), no. 3, 761–766. Article

For users without a MathSciNet license , Relay Station allows linking from MR numbers in online mathematical literature directly to electronic journals and original articles. Subscribers receive the added value of full MathSciNet reviews.