On the (15,5,\(\lambda\) )-family of BIBDs
The authors enumerate completely the 1-rotational (15,5,4)-BIBDs and two subclasses of cyclic, and 1-rotational (15,5,6)-designs, respectively, as well as the resolvable (15,5,6)-BIBDs with an automorphism of order 5. The lower bounds for the number of nonisomorphic designs are substantially improved.
(15,5,lambda)-balanced incomplete block designs
scientific article; zbMATH DE number 4118379
scientific article