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  1. 1
    Observations of f-region critical frequency variation over Batu Pahat, Malaysia during low solar activity
    by Abdullah, Sabirin
    Published 2011
    “... for communication. Critical frequencies are important parameters of the ionosphere. Due to the activities...”
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  2. 2
    Kajian awal variabiliti ionosfera di Parit Raja, Batu Pahat pada bulan september 2004
    by Abdullah, Sabirin
    Published 2004
    “... siang iaitu antara 6.8 hingga 12 MHz dan penurunan nilai frekuensi kritikal ini juga akan menurun ketika...”
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  3. 3
    Kajian awal variabiliti ionosfera di Parit Raja, Batu Pahat pada bulan September 2004
    by Abdullah, Sabirin
    Published 2004
    “.... The changes of the frequency is dependent on the solar activity in the morning. The highest critical...”
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