RT Journal Article SR Electronic T1 Some observations on the use of Azostix for the determination of blood urea nitrogen JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 125 OP 128 VO 100 IS 3 A1 P. W. Eby A1 J. E. Logan YR 1969 UL http://www.cmaj.ca/content/100/3/125.abstract