The following publications are possibly variants of this publication:
- About this and future issuesGeorge S. Axelby. automatica, 5(5):539-540, 1969. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 5(1):11-12, 1969. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 5(4):405, 1969. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 5(6):695-696, 1969. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 5(2):129-130, 1969. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 10(3):231-232, 1974. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 11(4):329, 1975. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 11(1):1, 1975. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 11(5), 1975. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 11(2):117, 1975. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 10(5):453, 1974. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 10(2):123, 1974. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 10(4):339, 1974. [doi]
- About this and future issuesGeorge S. Axelby. automatica, 11(6):565, 1975. [doi]