A note on ξ -conformally flat contact manifolds. De, U.C.; Biswas, Sudipta — 2006 Bulletin of the Malaysian Mathematical Sciences Society. Second Series
On LP-Sasakian manifolds. Shaikh, A.A.; Biswas, Sudipta — 2004 Bulletin of the Malaysian Mathematical Sciences Society. Second Series
On Φ -recurrent Sasakian manifolds. De, U.C.; Shaikh, A.A.; Biswas, Sudipta — 2003 Novi Sad Journal of Mathematics