Optik und Mechanik 52.2 (1931), pp. 25-26; also in Mitteilungen der HamburgerSternwarte in Bergedorf 36.7 (1932), pp. 15-17. Erik Schmidt (the son of August
proper motions north of −2.5 deg. declination. Hamburg-Bergedorf: HamburgerSternwarte. 1975. Bibcode:1975ascp.book.....H. Gontcharov, G.A. Spatial distribution