A.K. Gwal (Gwal, A.K. / A. K. Gwal / Gwal, A. K.)

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  Very Low Frequency (VLF) Phenomena
  by A. R. W. Hughes, Csaba Ferencz, A. K. Gwal
  Hardcover, Woodhead Publishing, Limited, ISBN 1842651293 (1-84265-129-3)
• 
  Very Low Frequency (Vlf) Phenomena
  by Csaba Ferencz, A. R. W. Hughes, A. K. Gwal
  Hardcover, Morgan & Claypool, ISBN 8173194858 (81-7319-485-8)