@**article**{RISC2374,author = {P. Lisonek},

title = {{Denumerants and their approximations}},

language = {english},

abstract = {Let $a,b,c$ be fixed, pairwise relatively prime positive integers.
We investigate the number of non-negative integral solutions
of the equation $ax+by+cz=n$ as a function of $n$. We present
a new algorithm that computes the ``closed form'' of this function.
This algorithm is simple and its time performance is better
than the performance of yet known algorithms.
We also recall how to approximate the above mentioned function
by a polynomial and we derive bounds on the ``error''
of this approximation for the case $a=1$.},

journal = {J. Combin. Math. Combin. Comput.},

volume = {18},

pages = {225--232},

isbn_issn = {ISSN 0835-3026},

year = {1995},

refereed = {yes},

length = {8}

}