@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();

		for (String genVer : this) {
			String name = nameByVersion.get(genVer).replace('_', ' ');
			String ref = referenceByVersion.get(genVer);

			sb.append("\t" + genVer);
			sb.append("\t" + name);
			if (ref != null) sb.append("\t" + ref);
			sb.append("\n");
		}
		return sb.toString();
	}