Undergraduate Texts in Mathematics
Hoffmann, Karl-Heinz; Hämmerlin, Günther (1991). Numerical Mathematics. doi:10.1007/978-1-4612-4442-4. ISBN 978-0-387-97494-1
Morrey, Charles B. Jr.; Protter, Murray H. (1991). A First Course in Real Analysis (2nd ed.). doi:10.1007/978-1-4419-8744-0. ISBN 978-0-387-97437-8
Bressoud, David M. (1991). Second Year Calculus: From Celestial Mechanics to Special Relativity. doi:10.1007/978-1-4612-0959-1. ISBN 978-0-387-97606-8
Millman, Richard S.; Parker, George D. (1991). Geometry: A Metric Approach with Models (2nd ed.). ISBN 978-0-387-97412-5
Palka, Bruce P. (1991). An Introduction to Complex Function Theory. ISBN 978-0-387-97427-9
Banchoff, Thomas; Wermer, John (1992). Linear Algebra Through Geometry (2nd ed.). doi:10.1007/978-1-4612-4390-8.