I don't know if the newer books by Niels Pfläging are available in English, but they are superior to those mentioned. Be warned, though, Pfläging is a bit of an

I don't know if the newer books by Niels Pfläging are available in English, but they are superior to those mentioned. Be warned, though, Pfläging is a bit of an obstructionist. Another interesting fellow is Daniel Mezick, whose writing is definitly available in English.