"Brewing Yeast and Fermentation" is by far the best resource I have come across -- highly technical, but at the same time extremely practical. Based almost entirely on peer-reviewed published research. "Essays in Brewing science" is very good. "Brewing" by Lewis is great for some topics, but he frequently gets caught up on particulars of chemistry which aren't always apposite to brewing. "Brewing" by Ian Hornsey is very good, sufficiently technical but not to the point of being tedius. "Handbook of Brewing," Second edition edited by Fergus G. Priest and Graham G. Stewart is another nice resource. Next on my list is Fix, De Clerk, and "Malting and Brewing Science", though the latter two are going to be difficult to obtain. "New Brewing Lager Beer" seems like it would be a good book, but it seems to me to too prescriptive "x is bad, don't do it", and based upon the author's own beliefs, rather than on solid research.