A new characteristic of the identity function JM De Koninck, I Kátai, BM Phong journal of number theory 63 (2), 325-338, 1997 | 34 | 1997 |

Additive niqueness sets for multiplicative function PV Chung, BM Phong Publ. Math. Debrecen 55, 237-243, 1999 | 32 | 1999 |

On sets characterizing the identity function BM Phong Ann. Univ. Sci. Budapest. Sect. Comput 24, 295-306, 2004 | 21 | 2004 |

Additive uniqueness sets for multiplicative functions KH Indlekofer, BM Phong Ann. Univ. Sci. Budapest. Sect. Comput 26, 65-77, 2006 | 19 | 2006 |

A characterization of the identity function BM Phong Acta Academiae Paedagogicae Agriensis, Sectio Mathematicae 24, 3-9, 1997 | 17 | 1997 |

A characterization of some arithmetical multiplicative functions BM Phong Acta Math. Hungar 63 (1), 29-43, 1994 | 17 | 1994 |

On a problem of A. Rotkiewicz P Kiss, BM Phong Mathematics of computation, 751-755, 1987 | 17 | 1987 |

Note on multiplicative functions satisfying congruence property II BM Phong, J Fehér Math. Pannon 10 (1), 133-138, 1999 | 15 | 1999 |

A characterization of the identity function with an equation of Hosszú type BM Phong Publ. Math. Debrecen 69 (1-2), 219-226, 2006 | 14 | 2006 |

Multiplicative functions satisfying a congruence property. V BM Phong Acta Mathematica Hungarica 62 (1), 81-87, 1993 | 14 | 1993 |

On Lucas pseudoprimes which are products of s primes P Kiss, BM Phong, E Lieuwens Fibonacci numbers and their applications 1, 131-139, 1986 | 13 | 1986 |

A characterization of the identity function with functional equations BUIM Phong Annales Univ. Sci. Budapest., Sect. Comp 32, 247-252, 2010 | 12 | 2010 |

Some unsolved problems on arithmetical functions I Kátai, BM Phong Ann. Univ. Sci. Budapest. Sect. Comput 44, 233-235, 2015 | 11 | 2015 |

On a function concerning second order recurrences P Kiss, BM Phong Ann. Univ. Sci. Budapest 21, 119-122, 1978 | 10 | 1978 |

A characterization of the identity with functional equations II. BM Phong Acta Math. Hungar. 148 (2), 450-465, 2016 | 9 | 2016 |

The functional equation f (A+ B)= g (A)+ h (B) I Kátai, BM Phong Annales Univ. Sci. Budapest. Sect. Comp 43, 287-301, 2014 | 9 | 2014 |

On some pairs of multiplicative functions correlated by an equation II I Kátai, BM Phong aequationes mathematicae 59 (3), 287-297, 2000 | 9 | 2000 |

On super Lucas and super Lehmer pseudoprimes BM Phong Studia Sci. Math. Hungar 23, 435-442, 1988 | 9 | 1988 |

Divisibility properties in second order recurrences P Kiss, BM Phong Publ. Math. Debrecen 26, 187-197, 1979 | 9 | 1979 |

A characterization of some unimodular multiplicative functions. II BM Phong Ann. Univ. Sci. Budapest. Eötvös Sect. Comput. 21, 187-194, 2002 | 8 | 2002 |