Reference:
Patric R.J. Östergård. Enumeration of designs. The Australasian Journal of Combinatorics, 22(1):227–231, 2000.
Suggested BibTeX entry:
@article{Ostergard:enumeration, author = {Patric R.J. \"Osterg\aard}, journal = {The Australasian Journal of Combinatorics}, number = {1}, pages = {227--231}, title = {Enumeration of $2-(12,3,2)$ designs}, volume = {22}, year = {2000}, }