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Dyfyniad Arddull ChicagoPress, China. Dr. Marina: Comparing the Covid-19 R0 in the Past 2 to 4 Weeks, It Reflects the Effectiveness of Measures. 2021.
Dyfyniad MLAPress, China. Dr. Marina: Comparing the Covid-19 R0 in the Past 2 to 4 Weeks, It Reflects the Effectiveness of Measures. 2021.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
