thanks for sharing, this is a interesting paper that include the basic LLC design topics. 

Is it possible to find out the example spice file, NCP1396A.asy and NCP1396A.lib?

Try this page: https://www.onsemi.com/products/power-management/ac-dc-power-conversion/offline-controllers/NCP1396#technical-documentation

It lists a SPICE model (called an ORCAD model, but will most likely work in LTspice) for the NCP1395, which may also contain the NCP1396, plus an application note, AND8255/D,  about simulating LLC in SPICE.

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Regards,
Tony