Review: T. Ya. Azizov and I. S. Iokhvidov, Linear operators in spaces with an indefinite metric

Well, someone can decide by themselves what they want to do and need to do but sometimes, that kind of person will need some linear operators in spaces with an indefinite metric references. People with open minded will always try to seek for the new things and information from many sources. On the contrary, people with closed mind will always think that they can do it by their principals. So, what kind of person are you?