RMarkdown test multicite

bibliography.bib

@Article{Bartel2004,
    Author="Bartel, D. P. ",
    Title="{{M}icro{R}{N}{A}s: genomics, biogenesis, mechanism, and function}",
    Journal="Cell",
    Year="2004",
    Volume="116",
    Number="2",
    Pages="281--297",
    Month="Jan",
    doi = {10.1016/s0092-8674(04)00045-5},
}

@article{Bartel2009a,
    abstract = {MicroRNAs (miRNAs) are endogenous ???23 nt RNAs that play important gene-regulatory roles in animals and plants by pairing to the mRNAs of protein-coding genes to direct their posttranscriptional repression. This review outlines the current understanding of miRNA target recognition in animals and discusses the widespread impact of miRNAs on both the expression and evolution of protein-coding genes. ?? 2009 Elsevier Inc. All rights reserved.},
    author = {Bartel, David P.},
    doi = {10.1016/j.cell.2009.01.002},
    file = {:home/sturm/Dropbox/Studium/articles/Bartel/Cell/Bartel - 2009 - MicroRNAs Target Recognition and Regulatory Functions.pdf:pdf},
    isbn = {00928674},
    issn = {00928674},
    journal = {Cell},
    mendeley-groups = {epigenetics/miRNAs/miRNAs (general)},
    number = {2},
    pages = {215--233},
    pmid = {19167326},
    title = {{MicroRNAs: Target Recognition and Regulatory Functions}},
    volume = {136},
    year = {2009}
}

multicite.Rmd

---
title: "test multicite"
author: "grst"
date: "June 26, 2017"
output: html_document
documentclass: book
bibliography: [bibliography.bib]
biblio-style: apalike
link-citations: yes
---

# Test citation

microRNAs are small (~22nt) non-coding RNAs playing an important role in gene regulation [@Bartel2004, @Bartel2009a]. 

# References