1
by Barr, M., Berthiaume, P., Day, B. J., Duskin, J.
Published 1969
Springer Berlin Heidelberg

2
by André, M., Barr, M., Bunge, M., Frei, A.
Published 1971
Springer Berlin Heidelberg

3
by Appelgate, H., Barr, M., Beck, J., Lawvere, F. W.
Published 1969
Springer Berlin Heidelberg

4
by Applegate, H.
Published 1970
Springer
Other Authors: '; ...Barr, M....

5
Published 1970
Springer Berlin Heidelberg
Other Authors: '; ...Barr, M....