@article{AM2_1973__9_136377,
     author = {N.S. MENDELSOHN and Y.S. HO},
     title = {Inequalities for f-designs with {Repeated} {Blocks} {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {312--313},
     publisher = {mathdoc},
     volume = {9},
     year = {1973},
     url = {http://geodesic.mathdoc.fr/item/AM2_1973__9_136377/}
}