$a Kp. A first course in real analysis / Murray H. Protter, Charles B. Morrey. - 2nd. ed. - New York, 1991. $b (Dept. of Mathematics, Univ. of California, Berkeley)
670
$a University of California, 27.09.3018 $b (In Memoriam) $u https://senate.universityofcalifornia.edu/_files/inmemoriam/html/murrayhprotter.html