TY  - DATA
AU  - Harper, John R.,
TI  - Secondary cohomology operations 
T2  - Graduate Studies in Mathematics, 
SN  - 9781470420987 (online)
PY  - 2002///
CY  - Providence, R.I.
PB  - American Mathematical Society
KW  - Homology theory
N1  - Includes bibliographical references (p. 261-266) and index
UR  - https://doi.org/10.1090/gsm/049
ER  -