TY  - JOUR
AU  - Gardner, B.
TI  - A Note on (r, λ)-Systems
JO  - Canadian mathematical bulletin
PY  - 1977
SP  - 511
EP  - 512
VL  - 20
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1977-077-5/
DO  - 10.4153/CMB-1977-077-5
ID  - 10_4153_CMB_1977_077_5
ER  -