Computation of affinity and selectivity: Binding of 2, 4-diaminopteridine and 2, 4-diaminoquinazoline inhibitors to dihydrofolate reductases. - John Marelius; Malin Graffner-Nordberg; Tomas Hansson; Anders Hallberg; Johan Åqvist (J. Comput. Aided Mol. Des., 1998)