By Iqbal J.   Purewal A. S.   Edington N.   in Acta Veterinaria Hungarica

ISSN:0236-6290|49|4|473-478

Akademiai Kiado‎(2001)‎

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By Purewal A.S.   Iqbal J.   Edington N.   in Virus Research

ISSN:0168-1702|54|2|189-195

Elsevier‎(1998)‎

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By Williams J.G.   Purewal R.S.   in Preventive Medicine

ISSN:0091-7435|32|2|103-108

Academic Press‎(2001)‎

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By Ahmad Aftab   Purewal Tejpal S   Sharma Dushyant   Weston Philip J   in Clinical Medicine

ISSN:1470-2118|11|6|524-528

Royal College Of Physicians‎(2011)‎

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