"Scalable Parallel Graph Algorithms", Mathematics and Computer Science Division, Argonne National Lab, Illinois, USA, January 7, 2013. (Host: Tom Peterka)

"A New Scalable Parallel DBSCAN Algorithm Using the Disjoint-Set Data Structure", International Conference on High Performance Computing, Networking, Storage and Analysis (Supercomputing'12), Salt Lake City, Utah, USA, Novermber 14, 2012.

"Scalable Parallel Union-Find Algorithms and Its Applications", FX Palo Alto Laboratory, Inc. (FXPAL), Palo Alto, California, USA, March 20, 2012. (Host: Lawrence A. Rowe)

"Graph Algorithms on the Cray MTA and XMT Computers", Department of Informatics, University of Bergen, Bergen, Norway, March 14, 2011.

"Parallel Greedy Graph Matching using an Edge Partitioning Approach", Fourth ACM SIGPLAN Workshop on High-level Parallel Programming and Applications (HLPP 2010), Baltimore, Maryland, USA, September 25, 2010. Slides

"Experiments on Union-Find Algorithms for the Disjoint-Set Data Structure", 9th International Symposium on Experimental Algorithms (SEA 2010), Ischia, Naples, Italy, May 22, 2010. Slides

"Experimental Evaluation on Union-Find Algorithms for the Disjoint-Set Data Structure", Numerical Mathematics Colloquium, Utrecht University, the Netherlands, April 27, 2010.

"A Scalable Parallel Union-Find Algorithm for Distributed Memory Computers", SIAM Workshop on Combinatorial Scientific Computing (CSC09), October 29-31, 2009, Monterey, CA, Presented as contributed talk (peer-reviewed). Abstract, Slides

"A Scalable Parallel Union-Find Algorithm for Distributed Memory Computers", Eighth International Conference on Parallel Processing and Applied Mathmatics (PPAM 2009), September 15, 2009, Wroclaw, Poland.

"Union-Find Algorithms for Distributed Memory Computers", Algorithm group seminar, May 29, 2009, Institute of Informatics, UiB, Norway.

"Union-Find Algorithms", ICT seminar, May 4-5, 2009, Voss, Norway.

"Minimum Face-Spanning Subgraphs of Plane Graphs", WALCOM 2007, February 12, 2007, Dhaka.

"Hardness of Finding Minimum Face-Spanning Subgraphs of Plane Graphs", November 21, 2006, CSE, BUET, Dhaka.