State of the industry: FoxPro add-ons / Gryphon R. // Data Based Advisor.-1995.-Vol.13, N 2.-P. 58-59.
State of the industry: FoxPro add-ons / Gryphon R. // Data Based Advisor.-1995.-Vol.13, N 2.-P. 58–59. 
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Спец.прикладные системы