@article{GDZPPN00205843X,
title = {Symmetry of Linking Coefficients.},
journal = {Commentarii mathematici Helvetici},
volume = {39},
year = {1964},
pages = {259-270},
zbl = {0127.13703},
url = {http://dml.mathdoc.fr/item/GDZPPN00205843X}
}
Haefliger, A.; Steer, B. Symmetry of Linking Coefficients.. Commentarii mathematici Helvetici, Tome 39 (1964) pp. 259-270. http://gdmltest.u-ga.fr/item/GDZPPN00205843X/