this book costs around $5.50 but contents are invaluable.

Hallo Abhishek,

the book I recommended in a former reply costed about 75 dollars. You can imagine, for a student who has only about 50 dollars a week to live with in expensive Germany, this was quite a heavy portion. But, as I already stated, my prof forced me to buy it! He told me, that I need not come to his seminar, without having this book.
To his excuse I must confess, that he gave me this book for some days, so that I could convince myself, that spending the money is adequate.

Bye,
Kai