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- Rajendra M. Pawale, Mohan S. Shrikhande, Shubhada M. Nyayate
- Electr. J. Comb.
- 2015

A quasi-symmetric design (QSD) is a 2-(v, k, λ) design with intersection numbers x and y with x < y. The block graph of such a design is formed on its blocks with two distinct blocks being adjacent if they intersect in y points. It is well known that the block graph of a QSD is a strongly regular graph (SRG) with parameters (b, a, c, d) with smallest… (More)

- Rajendra M. Pawale, Mohan S. Shrikhande, Shubhada M. Nyayate
- Discrete Mathematics
- 2016

- Shubhada M. Nyayate, Rajendra M. Pawale, Mohan S. Shrikhande
- Australasian J. Combinatorics
- 2017

A quasi-symmetric design (QSD) is a (v, k, λ) design with two intersection numbers x, y, where 0 ≤ x < y < k. The block graph of a QSD is a strongly regular graph (SRG), whereas the converse is not true. Using Neumaier’s classification of SRGs related to the smallest eigenvalue, a complete parametric classification of QSDs whose block graph is an SRG with… (More)

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