Das Photographische Objektiv / bearb. von W. Merté, R. Richter, M. von Rohr. - Wien, 1932.

LCC online

A history of the photographic lens / Rudolf Kingslake. - [S.l.], c. 1989, 8.03.2010 http://books.google.pl/books?id=OJrJrEJ-r9QC&pg=PA255&lpg=PA255&dq=Mert%C3%A9,+Willy,+1889&source=bl&ots=YY5p5Pw28A&sig=S_hhNU6x0JaB8WhTnqh_un1zFTI&hl=pl&ei=t_mUS8HwC9GJsAbf6YiTAw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CAYQ6AEwAA#v=onepage&q=&f=false