On the Integrality Gap of a Natural Formulation of the Single-Sink Buy-at-Bulk Network Design Problem. - Naveen Garg 001; Rohit Khandekar; Goran Konjevod; R. Ravi 001; F. Sibel Salman; Amitabh Sinha II (IPCO, 2001)

Integrated Logistics: Approximation Algorithms Combining Facility Location and Network Design. - Ravi Ramamoorthi; Amitabh Sinha II (IPCO, 2002)

Approximating k-cuts via network strength. - R. Ravi 001; Amitabh Sinha II (SODA, 2002)