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A proper edge $t$-coloring of a graph $G$ is a coloring of edges of $G$ withcolors $1,2,...,t$ such that all colors are used, and no two adjacent edgesreceive the same color. The set of colors of edges incident with a vertex $x$is called a spectrum of $x$. An arbitrary nonempty subset of consecutiveintegers is called an interval. We say that a proper edge $t$-coloring of agraph $G$ is interval in the vertex $x$ if the spectrum of $x$ is an interval.We say that a proper edge $t$-coloring $\varphi$ of a graph $G$ is interval ona subset $R_0$ of vertices of $G$, if for an arbitrary $x\in R_0$, $\varphi$ isinterval in $x$. We say that a subset $R$ of vertices of $G$ has an$i$-property if there is a proper edge $t$-coloring of $G$ which is interval on$R$. If $G$ is a graph, and a subset $R$ of its vertices has an $i$-property,then the minimum value of $t$ for which there is a proper edge $t$-coloring of$G$ interval on $R$ is denoted by $w_R(G)$.  In this paper, for some bipartite graphs, we estimate the value of thisparameter in that cases when $R$ coincides with the set of all vertices of onepart of the graph.

On one-sided interval edge colorings of biregular bipartite graphs