@article{1250131397, author = {Gillam, J.D.}, title = {A finite $p$-group $P = AB$ with $\Core(A)=\Core(B)=\{1\}$}, journal = {Rocky Mountain J. Math.}, volume = {3}, number = {4}, year = {1973}, pages = { 15-18}, language = {en}, url = {http://dml.mathdoc.fr/item/1250131397} }
Gillam, J.D. A finite $p$-group $P = AB$ with $\Core(A)=\Core(B)=\{1\}$. Rocky Mountain J. Math., Tome 3 (1973) no. 4, pp. 15-18. http://gdmltest.u-ga.fr/item/1250131397/