@article{GDZPPN002412691,
title = {Massey Products and H (p, q)-Systems.},
journal = {Mathematische Zeitschrift},
volume = {135},
year = {1973},
pages = {1-10},
zbl = {0249.55018},
url = {http://dml.mathdoc.fr/item/GDZPPN002412691}
}
Davis, Donald M.; Snaith, Victor P. Massey Products and H (p, q)-Systems.. Mathematische Zeitschrift, Tome 135 (1973) pp. 1-10. http://gdmltest.u-ga.fr/item/GDZPPN002412691/