It is a small book very readable, PAPER is very good as is the WRITE! The terms are well defined, it is very clear, in fact it gives almost want to read several definitions even if they do we are not useful at the moment!
There truly has a desire to do things properly, to be understood and open to genuine scientific curiosity! Unlike some books that you buy during his studies and, very quickly run out and brings us nothing, it persists becoming (despite the L1-L2 level) a small book to which we return with pleasure.
Note: the price is really reasonable, and quality at the appointment.
I recommend!