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              Abstract
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 In this note we establish a 1-to-1 correspondence between the class of generalized
 quadrangles with ovoids and the class of balanced incomplete block designs that
 possess a nontriangular local resolution system and have the appropriate parameters.
 We present a nontriangular local resolution system for a difference family BIBD
 construction of Sprott.
  
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              Keywords
              
                BIBD, balanced incomplete block design, combinatorial
                design, block design, design, difference family,
                generalized quadrangle, ovoid, spread
               
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              Mathematical Subject Classification
              
                Primary: 05B25
               
              
                Secondary: 05B05
               
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              Milestones
              
                Received: 2 January 2023
               
              
                Revised: 14 June 2023
               
              
                Accepted: 13 July 2024
               
              
                Published: 25 July 2024
               
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            | © 2024 The Author(s), under
            exclusive license to MSP (Mathematical Sciences
            Publishers). | 
           
         
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